Sheryl Crow Hosts House Concert Benefitting MusiCares

first_imgSheryl Crow recently performed an intimate concert in her barn in Nashville as part of the MusiCares House Concert Series.Among the stars who attended the show on October 30 were Peter Frampton, Jewel, and songwriter Marc Beeson Other guests included A&R executive Tracy Gershon, Academy of Country Music CEO Pete Fisher, and Recording Academy and MusiCares President/CEO Neil Portnow.“We’ve had two people that work for me, that if it weren’t for MusiCares, wouldn’t be here,” said Peter Frampton. “It’s very near to my heart. They’ve been so incredible. You give back where you can. It’s amazing what they can do.”“Sheryl’s been a great friend to the Academy for many years,” Portnow told Billboard. “As MusiCares has evolved and developed more and more artists learned about us, loved the mission and found ways to participate. … Sheryl is very aware what the organization does and now that we’ve embarked on this program we call ‘House Concerts,’ it’s an opportunity for artists to participate in a new and different way. What Sheryl is doing is a little out of the ordinary in a good way because she’s opened up her home for us and hosted this event right here.”last_img read more

Game Changer Metta World Peace Signs to New York

Metta World Peace is headed back to where it all started for him as a basketball player, New York City. The Queens native, who was recently amnestied by the Los Angeles Lakers, has reached an agreement to play with the New York Knicks.“I don’t care if I’m starting, or sweeping the floors. You hear me? I want to win,” World Peace said.Officials from the Knicks reported that they have agreed to terms with the NBA player, but a contract has not yet been signed.According to reports, on the table is a two-year contract with the first year guaranteed. World Peace would get $1.6 million per season, with a player option for year 2.World Peace’s agent Marc Cornstein confirmed the team that his client will be playing for next season.“Yes, this is going to happen,” Cornstein said. “He’s just thrilled to be joining the New York Knicks. He’s really excited to be joining his hometown team. That’s obviously been something that’s been a dream of his since growing up in Queensbridge.” read more

UConn And Gonzaga Are Very Different Kinds of NCAA Favorites

More: Apple Podcasts | ESPN App | RSS | Embed Embed Code Welcome to the latest episode of Hot Takedown, FiveThirtyEight’s sports podcast. On this week’s show (Mar. 28, 2017), we preview the Final Four in the men’s and women’s NCAA tournaments. Next, is Colin Kaepernick being blackballed by the NFL? We investigate. Finally, we preview the American League and ponder who might take down the Red Sox, Indians and Astros. Plus, a significant digit on the Oakland Raiders’ upcoming move to Las Vegas.As promised, a photographic throwback to Kate Fagan’s days as a professional basketball player for the Colorado Chill.In the aftermath of the latest round of the men’s NCAA tournament, Neil explained why this year’s Final Four is built on defense.ESPN notes that the men’s Final Four is full of unfamiliar faces this year.FiveThirtyEight’s Benjamin Morris says UConn’s path to perfection has become much easier.ESPN’s Dan Graziano argues that no matter which side of the Colin Kaepernick debate you’re on, you’re wrong.Check out FiveThirtyEight’s chats previewing the AL East, AL Central and AL West.Significant Digit: $750 million, the public subsidy that was offered to the Oakland Raiders to move to Las Vegas. According to The New York Times, Las Vegas politicians raised taxes to supply this new funding. FiveThirtyEight read more

World Wetlands Day 2018 Wetlands for a Sustainable Urban Future Wetland cleanup

first_imgFacebook Twitter Google+LinkedInPinterestWhatsApp#TurksandCaicos, January 25, 2018 – Providenciales – On the 2nd of February each year World Wetlands Day is celebrated.  This day marks the date of the adoption of the Convention on Wetlands on 2 February 1971, in the Iranian city of Ramsar.  The Department of Environment and Coastal Resources (DECR), together with the Turks & Caicos National Trust (TCNT), will be hosting Wetland Clean-ups to commemorate this day, as well as to take the opportunity to teach the community at large, about the importance of conserving wetlands in the Turks & Caicos Islands.Join the DECR on Saturday, 3 February, from 07:30 – 09:00am at Wheeland Pond, Blue Hills, Providenciales or at North Creek (meeting point: west side of the mouth) in Grand Turk in an attempt to conserve our wetlands for a sustainable urban future! Related Items: Please take this opportunity to get involved in your local community and to ensure wetlands for a sustainable urban future!For more details, please contact Amy Avenant (DECR Environmental Outreach Coordinator) at 338-4176 or [email protected]: TCIG Wetlands are often an undervalued natural resource and are important to the TCI for the following reasons:Wetlands ensure fresh water and replenish ground water;Wetlands purify and filter harmful toxins;Wetlands are a breeding ground for many commercially important fish species;Wetlands provide vital habitats for migratory birds;Wetlands ease flooding and safeguard against drought;Wetlands reduce the impacts of erosion; andWetlands provide sustainable livelihoods. Facebook Twitter Google+LinkedInPinterestWhatsApplast_img read more

BAHAMAS Energy Conference opens at Baha Mar

first_imgFacebook Twitter Google+LinkedInPinterestWhatsApp#Bahamas, January 30, 2018 – Nassau – Diversification of fuels, a comprehensive regulatory framework, the introduction of renewable energy sources, a new generating plant and green island project are among the strides the Bahamas Government has made in the energy sector.  The Hon. Desmond, Minister of Works, underscored that notwithstanding the country’s challenges it has and continues to make “incremental” advances in this area.Minister Bannister addressed the opening of the 18th Annual Platts Caribbean Energy Conference, Thursday, January 25th, 2018 at Grand Hyatt Baha Mar.  The two-day event focuses on key issues facing the Caribbean energy sector.Topics include: Market Structure and Stakeholder Alignment, Financing for Small Countries, Regional Demand, Fuel Conversion Viability, Renewable Energy, Managing Distributed Generation and Integrated Resource Plans.  A panel discussion and case studies also comprise the conference agenda.  There is a diverse range of speakers on the agenda including Darnell Osborne, Chairman, Board of Directors, Bahamas Power and Light.In his welcome, Minister Bannister noted the following as the  “fundamental” importance of the conference: the renewal of contacts industry-wide, the discussion and analysis of critical issues of mutual interest, and the sharing of innovative ideas with colleagues from diverse backgrounds from around the world.Minister Bannister said The Bahamas is currently ensuring the security of its energy supply through the diversification of fuels even as it continues to modernize the energy infrastructure.  In this regard, he said a proposal is in place to remove the price volatility with a generation mix that is 100% based on fossil fuel.“With the introduction of tri-fuel generation (liquid natural gas, diesel and heavy fuel oil), The Bahamas will have the flexibility of selecting its fuel based on any number of reasons including price.“We also continue to focus on the development of a comprehensive governance/regulatory framework to effectively support the advancement of the energy sector to be effectively able to facilitate energy conservation and efficiency through the introduction of renewable energy sources such as solar, ocean energy, biofuels, waste to energy and where possible, wind.”He said it is anticipated that a new state-of -the-art generating plant will soon be constructed with the best in class efficiencies for single cycle power generation.  He told the audience that the new facility will improve the generation capacity, modernize the plant, and provide newer technologies together with higher levels of energy conservation and improved efficiencies when compared to existing assets.Minister Bannister remarked that cost effective, progressive ideas for creating and installing renewable energy resources are “critical” to The Bahamas.“Every year we face the threat of hurricanes that may impact the vibrancy of life in our many islands.  Finding a niche in the spectrum of opportunity will be of great value to our country.“We have the perfect environment to foster small scale renewable generation in our many Family Islands, and we embrace this emerging technology to assist in the further development and modernization of our energy infrastructure as we seek to improve our conservation and efficiency capabilities.”He told the delegates that the nation’s challenges provide great opportunity for those who are able to propose innovative, enterprising and dynamic ideas for solutions and he is certain officials will be pleased to engage in meaningful discussion with them.  As an archipelago, practical energy solutions must be provided to numerous islands, all diverse, and each in differing stages of development.“There is no magic formula that that provides an answer to every need. We will, therefore, listen with interest to the various presenters, and consider many of the ideas that you propose as we seek to make decisions that will impact the lifestyles of our residents for decades to come.”S&P Global Platts is the leading independent provider of information, benchmark prices and analytics for the energy and commodities markets. By: Kathryn CampbellPhoto caption:  The Hon. Desmond Bannister, Minister of Works, addresses the opening session of the 18th Annual Platts Caribbean Energy Conference. (Photo/Courtesy BPL) Facebook Twitter Google+LinkedInPinterestWhatsAppcenter_img Related Items:last_img read more

United lacked mad dogs in midfield Mourinho

first_imgJose Mourinho has blamed his midfielders’ lack of bite in the middle of the park for their recent stalemate against Southampton at St Mary’s stating they lacked “mad dogs”The Saints went 2-0 up after 20 minutes courtesy of Stuart Armstrong and Cedric Soares but the Red Devils levelled proceedings to 2-2 before half-time thanks to goals from Romelu Lukaku and Ander Herrera.But Mourinho felt his side would have done better if they had fought valiantly in the middle, claiming his midfielders did not understand that “simplicity is genius” when trying to link the defence to the attack in a lifeless second half.“We lost so many balls in midfield, so many balls in our transition to the last third that it was difficult to have that continuity,” he told BT Sport and equally cited on FourFourTwo.“We did so well in the last 15, 20 minutes of the first half, we chose to connect to the attacking players by transporting the ball, the right choice of pass, accelerating the game, but in the second half, we went back to that dynamic.harry maguire, manchester UnitedMaguire says United need to build on today’s win George Patchias – September 14, 2019 Harry Maguire wants his United teammates to build on the victory over Leicester City.During the summer, Harry Maguire was referred to as the ultimate…“The players don’t understand that simplicity is genius. They keep, keep going to complicated football. But [there was] good spirit, good fight, a great example of players fighting until the limit. I would say, as positive examples, Marcus Rashford, Phil Jones, many others showing that respect for the shirt.“The second goal was a direct free-kick and the first was because we didn’t press enough the ball, which is something we do wrong. It doesn’t matter the system we play, it has to do with the characteristics of the players.“We don’t have many – I hope people understand what I mean – we don’t have many mad dogs, who bite the ball all the time. Scott and Matic did a very positive job for two midfield players and Phil Jones leads that group of three in a way we are totally in control.“What we needed to improve in this game is simplicity in midfield. By losing so many balls in midfield, we broke that dynamic that normally leads to goals.”last_img read more

Pjanic wary of Atletico Madrids threat

first_imgMiralem Pjanic admits Juventus need to improve their Champions League form as he suggested Atletico Madrid have a “similar philosophy” to the Serie A side.The first leg of the Round of 16 is at the Wanda Metropolitano Stadium on Wednesday evening.And Pjanic is wary of the threat posed by Diego Simeone’s men owing to their tactics and style of play.“Their philosophy is not easy to deal with at all, so it’s up to us to control both games and most importantly try to score a goal in Madrid,” the midfielder told Football Italia.“Atleti do have a lot of similarities with Juve, as both teams are solid, allow few spaces and don’t concede many goals.“They are very aggressive when marking or pressing opposition players, whereas we have stronger individual talents. That is where we must make the difference over the two legs.”The Champions League Final this season will be played at the Wanda Metropolitano.“They’ll be even more motivated because they want to play the Final on home turf, having played two in the last five years. They’ve got the same record reaching the Final in that period as Juve.”Gerard Pique, Neymar, BarcelonaLa Liga Betting: Match-day 4 Stuart Heath – September 14, 2019 Despite it being very early into La Liga season, both Barcelona and Real Madrid have had unprecedented starts to their campaigns. With this in…Pjanic claims the arrival of Cristiano Ronaldo means Juventus are among the favourites to win the Champions League, which would be their first since 1996.Everyone. Everywhere. #GETREADY#AtletiJuve #UCL #FinoAllaFine #ForzaJuve pic.twitter.com/yyuRKtMpMc— JuventusFC (@juventusfcen) February 17, 2019“We feel strong, even if we’ve been knocked out of the Coppa Italia by Atalanta. Other than that, we’ve only had great results this season.“There have been some more complicated matches lately, so we need to improve in two or three areas when facing these knockout ties.“We’ve conceded too many goals recently and it is not like us. The team must defend as a unit and when I say all together, I really mean it. Even the strikers must participate in helping the defence.“This is an important year and we’ve got to focus.”last_img read more

Flatland we hardly knew ye Unique 1D metasurface acts as polarized beam

first_imgStructure of the metasurface beam splitter. (a) Schematic diagram. TM light enters the slits in plasmonic waveguide mode and is reflected by the bottom Al layer. The light is strongly negatively reflected, as indicated by the chromatic sector. The reflection includes light corresponding to lateral SPR, as shown by green arrow, and light in the non-diffraction zone shown in Fig. 2(b1) and Fig. 3(b1). TE light cannot enter the slits and is primarily reflected. (b) SEM images of the top and side views (insets) of the fabricated device. The grating pitch is T = 420 nm, the width of the dielectric PMMA is t1 = 170 nm, and the width of the metal Al in the bottom PMMA-Al grating layer is t2 = 250 nm. The thicknesses of the PMMA and Al are h1 = 110 nm and h2 = 30 nm, respectively. The size of the Al on the sidewalls of the PMMA grating lines is t3 ´ h3 = 20 nm ´ 110 nm. The substrate is silicon. Credit: Zheng J et al. Highly anisotropic metasurface: a polarized beam splitter and hologram. Scientific Reports 4, 6491 (29 September 2014). “Our technique is quite different from that generally employed in metamaterials research, where very fine nano-size resonators are often required to achieve a specific function, and where the diffraction effect – while more efficient and robust in either periodical or aperiodical structures – is rarely considered,” Ye points out. Our study gave us the profound perspective that we can gain knowledge by utilizing long-established basic mechanisms to alleviate the difficulty of nano-optical device fabrication, rather than by pursuing very complex metastructures without considering cost and application practicality.”Summarizing their approach to creating a novel polarized beam splitters, Ye says that a dielectric grating was fabricated by nano-imprinting or laser interference on a silicon or glass substrate. “The grating was subsequently coated with ten nanometers of metal film by E-beam evaporation,” he tells Phys.org. “In order to narrow the slits to restrain the TE diffraction, the deposition was optimized to make the metal film conform to the dielectric grating as far as possible. In doing so, the metal deposited on the side walls of the grating lines helped reduce the slit width.”The paper discusses how metasurface beam splitting enables a broad range of useable wavelengths and incident angles with flexible tunability in operation by not relying on a resonant coupling mechanism. “For the metasurface polarized beam splitter with TM negative reflection/TE reflection, the upper limit of the working wavelength is determined by the pitch, and the lower limit is decided by the slit width. Thus,” he explains, “by choosing appropriate grating pitch and slit width, the polarized beam splitting can be achieved. For further improving the extinction ratio, it needs to optimize silt and metal thickness.” Therefore, the device is flexible tunability in a wide range of spectra which is more robust than those beam splitters using resonant mechanism in which grating height, refractive index, pitch and duty circle must be precisely designed.”Relatedly, our metasurface holograph – decodable only by transverse-magnetic polarized light –consists of a bilayer metal grating which ensures that only TM light can be diffracted. This means that the metasurface hologram can only be decodable by TM light, and the real image is reconstructed in the reflection side with the negative first order refraction.” Periodically constructed metamaterials, in which permittivity (a measure of how an electric field affects, and is affected by, a dielectric medium) and permeability (the degree of magnetization that a material obtains in response to an applied magnetic field) have simultaneous negative values, creating negative refraction (a dimensionless number that much light is bent when entering a material. More information: Highly anisotropic metasurface: a polarized beam splitter and hologram, Scientific Reports 4, 6491 (29 September 2014), doi:10.1038/srep06491 © 2014 Phys.org Improving terahertz optics with efficient broadband antireflection coatings Journal information: Scientific Reports In addition to the 1-D metasurface applications discussed in the paper – displays, holograms, and laser optics – Ye mentions several others:Compact reflective mirrors for laser cavities where the polarized output is required to meet the coherence for optical communication or laser interferenceDiffractive gratings in optical spectrometers, where the TM diffraction efficiency is stably high in a wide waveband with high angle resolution since the pith is only several hundred nanometers, which has several advantages: as a reflection element it provides a range of benefits, such as allowing the controlling circuit to be placed below the reflective surface, and more advanced integrated circuit technology becomes available when the substrate materials are not limited by their opaqueness; and a folded light path wherein the input and output light beam share the same physical space, which offers a desirable compact arrangementAs a novel plasmonic beam splitter, it can also be implemented in integrated optics devices for communication: TM light is diffracted into one waveguide and TE light is reflected into the other, allowing the two beams to be manipulated for further useThere are also long-term implications of a higher-security anti-counterfeit plasmonic hologram produced by adding the additional criterion of what Ye refers to as the “simple example” of polarization dependence demonstrated in the paper. “The greater enlightenment is that plasmonic effects can be used for higher-security anti-counterfeits,” he confirms. “In fact, not only the polarized diffraction-change of the brightness but also the polarized reflection-change of the color can be utilized as new criterions to judge a hologram.” Yet another advantage of the plasmonic anti-counter faking is that optical resonance can be well-engineered by the thickness of metal films, slit width and grating pitch, substantially increasing the cost and difficulty of fakery – especially for a complex pattern with several values of pitch, metal thickness and direction of the metallic nanowire grating. “In a word,” Ye notes, “we open a new door for the application of metasurface devices in anti-counter faking.”Moving forward, in the near future the scientists are planning to create a theoretical 1-D metasurface model that presents a quantitative effective refractive index to analyze structural properties, thus facilitating further device design. “In the long-term,” he adds, “for polarized beam splitting we plan to increase the waveband and extinction ratio for both reflection and negative reflection simultaneously by using a more delicate nanowire arrangement. Moreover, in addition to our current emphasis in anti-counter faking, we’ll be looking at other applications, including integrated optics, spectrometers and laser cavities.” Another important innovation that the researchers might consider developing is combining actively tunable metasurfaces with other techniques, such as liquid crystals and electrowetting. “Tunability will enable metasurfaces to be applied to displays, optical storage and communications,” Ye tells Phys.org. “Also, we’re considering if the optical properties we’ve observed can be extended to other frequency spectra – for example, the terahertz range, since doing so may help us to build terahertz devices. In closing, Ye says that other areas of research, such as high-field laser physics, might also benefit from their study. Citation: Flatland, we hardly knew ye: Unique 1-D metasurface acts as polarized beam splitter, allows novel form of holography (2014, October 24) retrieved 18 August 2019 from https://phys.org/news/2014-10-flatland-knew-ye-unique-d.html (Phys.org) —Traditional three-dimensional (3-D) plasmonic metamaterials with metallic structures – artificial materials that exploit coherent delocalized electron oscillations known as surface plasmons produced from the interaction of light with metal-dielectric materials – exhibit unique electromagnetic properties not found in natural materials, such as extraordinary transmission beyond the diffraction limit, efficient light-harvesting ability, plasmonic color filtering, and the ability to control the reflection or transmission direction of a light beam. However, they are difficult to fabricate, have a narrow usable bandwidth due to their resonant character, and exhibit low optical efficiency due to the inherent metal absorption. While two-dimensional metasurface structures have been proposed in an attempt to address these functional limitations, they still require complex designs and sophisticated fabrication procedures. Spectra and photos of a 280-nm-pitch grating. (a) Measured (solid lines) and simulated (dashed lines) NR (blue and cyan lines) and reflection (red and magenta lines) spectra for TM (blue and red lines) and TE (cyan and magenta lines) light with an incident angle of 60o. The inset is the simulated extinction ratio of NRTM/NRTE. (b) Photos of the device irradiated by un-polarized white light with an incident angle of approximately 60o and filtered by a polyvinyl alcohol (PVA) plastic polarizer (extinction ratio of 300). The yellow dotted line indicates the direction of the grating lines. The white dashed lines illustrate the electric field direction of the light passing through the polarizer. An SEM image of the device is also presented. The dielectric grating in the device was fabricated by laser interference, with an Al thickness of 50 nm. Credit: Zheng J et al. Highly anisotropic metasurface: a polarized beam splitter and hologram. Scientific Reports 4, 6491 (29 September 2014). Optical performance is not the only issue the scientists faced: The fabrication challenge is that in order to obtain high extinction ratio for both negative reflection and reflection, the ratio between the silt-width and pitch is always smaller than ½ – that is, the exposure condition for laser interference lithography (LIL) should be optimized. “The issue will be more challenging as the slit-refractive index increases, because the slit width should be further reduced to achieve the cut-off effect,” Ye notes. “Smarter design of the grating structures is needed for the high extinction ratio of both reflection and negative reflection, especially for a very wide waveband device.”The third challenge was combining the intrinsically fringed structure of a hologram and the anisotropic character of metasurface beam splitter. “In a hologram, the interference fringes usually have random direction, pitch, duty cycle, and depth,” Ye points out. “Therefore, to combine the hologram and beam splitter, photoresist processing and recording parameters should be well-designed in order to get deep and narrow slits for guaranteeing high-efficiency of TM light and inhibiting TE diffraction simultaneously. Otherwise, extinction ratios for both negative reflection and reflection will be lowered.” Moreover, since a laser hologram is usually recorded on photoresist film in the form of fringes caused by two-beam interference, the patterns are typically fringed structure with pitch decided by the wavelength and angle between the interference beams. “To obtain maximum diffraction efficiency,” Ye explains, “the fringes should be deep enough – but the contradiction is that deepening photoresist fringes causes slit width to increase, which in turn weakens anisotropy.”The researchers leveraged a range insights and techniques to address these challenges. “In our one-dimensional metasurface, the key point was fully combining the intrinsic properties of dielectric-metal-dielectric slit and the diffraction characteristics of grating, and finding the proper parameters to meet the required waveband,” Ye recounts. “At the same time, the starting point of our research is physically as simple and fundamental as the description in classic optics textbooks that for diffraction to exist in a grating, the light should be able to enter into the slits. Therefore,” he explains, “by considering the fact that in metal-insulator-metal waveguides TM mode is always supported while TE mode is dissipative in sub-wavelength size, we intuited that TM diffraction can be made to break the diffraction limit – corresponding to vector diffraction optics – while for TE light the diffraction should disappear without ‘sensing’ the slits, corresponding to geometrical optics.” The demonstration of the hypothesis not only convincingly reveals a new way to control photons, but also gives a very clearly physical image for the transition between scalar optics (where the optical phenomena can be described by scalar diffraction) and nano-optics (where the wavelengths are much larger than the size and pitch of the resonant units so the diffraction is therefore absent.) Recently, scientists at Shanghai Jiao Tong University proposed a unique method for controlling photons with a 1-D metasurface that, by integrating diffraction, waveguide, and plasmonic effects, is fundamentally distinct from 2-D or 3-D methods. The 1-D metasurface they presented, based on bilayered metallic nanowire gratings, behaves as an ideal polarized beam splitter that produces highly anisotropic strong negative reflection for transverse-magnetic (TM) light and efficient reflection for transverse-electric (TE) light. (Anisotropy is the property of being directionally dependent, as opposed to isotropy, which implies identical properties in all directions.) Moreover, by combining this feature with the fringed structure of a hologram, the researchers demonstrated a higher-security anti-counterfeit metasurface holograph, that can be decoded only by TM light.Dr. Zhicheng Ye discussed the paper that he, Dr. Jun Zheng and their co-authors published in Scientific Reports with Phys.org. A key factor is simplifying the metastructure to a one-dimensional metasurface using a bilayer metallic nanowire grating. “Designing three- or two-dimensional nanoantenna arrays can modify the optical wavefront with spatially-varying phase response,” Ye tells Phys.org. “However, complex designs and sophisticated fabrication procedures are required. Simplifying the metastructure to one dimension is preferred for applications and large-scale production, but the structure that allows tunable parameters is limited. Therefore, the main challenges to achieve specific functions using bilayer metallic nanowire grating involve exploring and utilizing the intrinsic properties of surface plasmon waveguide, combining these with the diffraction characteristics of grating, and finding proper parameters.”Relatedly, Ye continues, using bilayer metallic nanowire gratings with nano-slits as 1-D metamaterials to realize both polarized negative reflection and reflection carries its own challenges. “Thus far, the dielectric or metal beam splitters based on gratings usually have narrow working spectrum and angle range. On the other hand, these studies have typically focused only on transmission and reflection properties – but polarized diffraction has not been considered,” he explains. “We proposed the bilayer metallic nanowire gratings with nano-slits as 1-D metamaterials to realize polarized negative reflection for transverse-magnetic light and reflection for transverse-electric light, with a broad range of useable wavelengths and incident angles.” The key point is that metasurface beam splitting does not rely on a resonant coupling mechanism, thereby enabling a broad range of useable wavelengths and incident angles, with flexible tunability in operation. “The main challenge was determining how to simultaneously realize broadband, angle-insensitivity and high polarization extinction ratios. Our research shows that, the grating pitch should be large enough to ensure a broad working spectrum; the slit should be wide enough to insure that transverse-magnetic light can be refracted strongly, but also thin enough to suppress TE refraction efficiently; and the proper slit height should significantly enhance the polarization extinction ratio.” Metasurface hologram. (a) Photoresist hologram fabrication scheme: The badge was placed perpendicularly to the photoresist film, and both were illuminated by a large cross-section collimated laser beam with an incident angle of 49o to the photoresist film. (b) Microscopy and SEM images of the top views of the metasurface hologram film at different scales. The film consists of randomly distributed B-MNGs with a pitch of 300 nm. The width of the dielectric PMMA is t1 = 150 nm, and the thicknesses of the PMMA and Al are h1 = 110 nm and h2 = 50 nm, respectively. (c) Real images reconstructed using TM and TE laser light, respectively. The metasurface hologram was illuminated by a TM or TE laser with a wavelength of 532 nm and an incident angle of 75o. The reconstructed real 3-D image was formed by the negative first-order diffraction mode with a diffractive angle of 55o and was imaged onto a black screen, as presented in the bottom left pictures. The image was also viewed with a camera, as presented in the top right pictures, or directly by eye. Credit: Zheng J et al. Highly anisotropic metasurface: a polarized beam splitter and hologram. Scientific Reports 4, 6491 (29 September 2014). Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more