Article
Optics
Jaeyeon Yu, Seongjin Park, Inyong Hwang, Daeik Kim, Frederic Demmerle, Gerhard Boehm, Markus-Christian Amann, Mikhail A. Belkin, Jongwon Lee
Summary: Nonlinear polaritonic metasurfaces, created by coupling intersubband nonlinearities in semiconductor heterostructures with optical modes in nanoresonators, have demonstrated efficient frequency mixing at very low pumping intensities. This electrically tunable nonlinear metasurface combines a plasmonic nanocavity and a quantum-engineered semiconductor heterostructure, enabling spectral tuning, dynamic intensity modulation, and dynamic beam manipulation for second-harmonic generation. This work paves the way for electrically reconfigurable flat nonlinear optical elements with versatile functionalities.
Article
Chemistry, Multidisciplinary
Ping Yu, Jianxiong Li, Na Liu
Summary: This research demonstrates the use of liquid crystals as a thin surrounding medium for electrically tunable optical metasurfaces, achieving rapid and reversible polarization rotation of linearly polarized light at visible frequencies. By controlling both the geometric and propagation phase tuning capabilities, flexible control over the polarization angle is achieved.
Article
Nanoscience & Nanotechnology
Wei Luo, Syeda Aimen Abbasi, Shaodi Zhu, Xuejin Li, Ho-Pui Ho, Wu Yuan
Summary: This paper proposes and theoretically studies a novel graphene metasurface-based electrically switchable and tunable infrared light modulator. By harnessing the photon localization effect of the guided-mode resonance in the metasurface structure, the graphene electroabsorption is greatly enhanced, leading to a high-performance light modulator. The modulator can switch between a perfect absorber and a reflective polarization converter with high conversion efficiency (>90%) at 1550 nm by fine-tuning the Fermi energy of graphene.
Article
Nanoscience & Nanotechnology
Derek de Jong, Julian Karst, Dominik Ludescher, Moritz Floess, Sophia Moell, Klaus Dirnberger, Mario Hentschel, Sabine Ludwigs, Paul V. Braun, Harald Giessen
Summary: We propose an electrically switchable, compact metasurface device based on PEDOT:PSS and a gel polymer electrolyte. By applying square-wave voltages, the PEDOT:PSS can be reversible switched from dielectric to metallic state. We demonstrate a compact standalone metadevice that allows for electrically controlled tuning of plasmonic resonances and beam switching. Our work paves the way for solid-state switchable metasurfaces and switchable holographic devices.
Article
Nanoscience & Nanotechnology
Hyunwoo Park, Sodam Jeong, Changwon Seo, Hyeongi Park, Donghak Oh, Jae-Eon Shim, Jaeyeong Lee, Taewoo Ha, Hyeon-Don Kim, Soojeong Baek, Bumki Min, Teun-Teun Kim
Summary: In this study, the researchers demonstrate that the phase retardation of a THz wave can be electrically controlled by integrating patterned mono- and bilayer graphene onto an isotropic metasurface. By modulating the conductivity of graphene, the refractive index for one of the polarization states can be controlled, allowing for the manipulation of electromagnetic wave polarization states. This work opens up opportunities for the development of compact THz polarization devices and polarization-sensitive THz technology.
Article
Chemistry, Multidisciplinary
Kandammathe Valiyaveedu Sreekanth, Rohit Medwal, Yogesh Kumar Srivastava, Manukumara Manjappa, Rajdeep Singh Rawat, Ranjan Singh
Summary: The study demonstrates dynamic color generation using electrically tunable thin film optical coatings consisting of two different phase change materials. These coatings excite Fano resonance through structural phase switching, covering the entire visible spectrum and showing wide applications in tunable displays and active nanophotonic devices.
Article
Optics
Yue Wang, Dajian Cui, Yu Wang, Guohui Yang, Chunhui Wang
Summary: In this paper, an all-solid-state and hybrid electrically/thermally tunable multifunctional metasurface array is proposed, based on graphene pattern and vanadium dioxide configuration. It can achieve band-stop filtering, beam steering, and beam splitting functions, showing great potential in the field of multifunctional integrated chips.
Article
Chemistry, Multidisciplinary
Saurabh Kishen, Jinal Tapar, Naresh Kumar Emani
Summary: This study demonstrates through numerical simulations that electrically driven nano-strip tunnel junctions can achieve switchable and highly directional light emission. The emission can be tuned by changing the structure and periodicity of the sources, enabling wavelength-selective directional switching and paving the way for electrically driven, reconfigurable light sources.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Kandammathe Valiyaveedu Sreekanth, Rohit Medwal, Chandreyee M. Das, Manoj Gupta, Mayank Mishra, Ken-Tye Yong, Rajdeep Singh Rawat, Ranjan Singh
Summary: In this experiment, tunable plasmonic resonances at visible wavelengths were achieved using the chalcogenide semiconductor alloy Sb2Te3, showing different properties of plasmonic resonances based on different nanostructures in this material. Electrically tunable Sb2Te3-based plasmonic devices could potentially be applied in the development of active color filters.
Article
Nanoscience & Nanotechnology
Zhengang Lu, Chao Xia, Yilei Zhang, Jiubin Tan
Summary: This study introduces and fabricates a novel metasurface with electrically tunable microwave amplitude and high optical transparency in the visible-infrared broadband. By integrating meshed electric-LC resonators and patterned VO2, the metasurface achieves efficient transmission and can be continuously tuned within a wide wavelength range. The research provides a simple and practical method for optically transparent metasurfaces with electrically tunable properties, paving the way for their application in various fields.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Optics
Ruisheng Yang, Fuli Zhang, Zhichen Li, Quanhong Fu, Yuancheng Fan
Summary: This paper proposes and experimentally demonstrates a controllable electromagnetically induced transparency (EIT)-like response in a terahertz hybrid metasurface. The biased silicon layer can significantly change its conductivity and thickness with increasing external current. The electrically controllable hybrid metasurface exhibits complete electrical switching on the EIT-like response. The use of the biased silicon layer provides an alternative method to overcome the narrowband operation bandwidth of photonic devices, which may inspire new innovations in high-performance terahertz applications.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Pin Chieh Wu, Ruzan Sokhoyan, Ghazaleh Kafaie Shirmanesh, Wen-Hui Cheng, Harry A. Atwater
Summary: This study demonstrates dynamic control of the polarization state of reflected light from an active metasurface by modulating the carrier concentration in ITO through applying an electrical bias. The ability to convert linearly polarized incident light to cross-polarized, circularly polarized, or elliptically polarized light upon reflection has wide applications in dynamic wave plates, spatial light modulators, and adaptive wavefront control.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Junghyun Park, Seong Jun Kim, Volker J. Sorger, Soo Jin Kim
Summary: We propose an electrically tunable metasurface that can control the optical properties at a subwavelength scale in the mid-infrared range. By adjusting the charge carrier concentration, the reflected light's amplitude and phase can be modulated. The device also offers versatile wavefront shaping capabilities.
Article
Optics
Jonathan King, Chenghao Wan, Tae Joon Park, Sanket Deshpande, Zhen Zhang, Shriram Ramanathan, Mikhail A. Kats
Summary: We demonstrate an electrically controlled VO2-metal metasurface that functions as a tunable optical switch, optical limiter with tunable threshold, and nonlinear optical isolator. The device achieves tunability through Joule heating and shows promising applications.
Article
Optics
JinLong Feng, XiePeng Chen, Lin-Sheng Wu, Jun-Fa Mao
Summary: A broadband tunable reflective graphene-based linear polarization converter (GLPC) integrated with a periodic double split ring resonator (DSRR) in the millimeter-wave regime is proposed in this study. The tuning characteristic of the GLPC is analyzed using full-wave simulations and the equivalent circuit model method (ECM). The GLPC prototype's co- and cross-polarized reflection coefficients were measured, and the reflectivity can be controlled by changing the bias voltage. The designed GLPC shows potential applications in radar cross-section reduction, antenna design, and stealth technology.
Article
Nanoscience & Nanotechnology
Chunghwan Jung, Younghwan Yang, Jaehyuck Jang, Trevon Badloe, Taejun Lee, Jungho Mun, Seong-Won Moon, Junsuk Rho
Summary: The study introduces a fully switchable structural coloration technique that can display and hide images by controlling the polarization of incident light, achieving near-zero scattering when colors are turned-off. The metasurfaces are composed of triple-nanofin structures, which can cover the full color spectrum and have potential applications in various fields.
Article
Multidisciplinary Sciences
Chunghwan Jung, Soo-Jung Kim, Jaehyuck Jang, Joo Hwan Ko, Doa Kim, Byoungsu Ko, Young Min Song, Sung-Hoon Hong, Junsuk Rho
Summary: This study proposes an ultrafast and full-color humidity sensor that utilizes the expansion and contraction of chitosan hydrogel to change its resonant frequency, resulting in a response time 10(4) times faster than traditional designs. The sensor achieves fast gas permeation through gaps between metal nanoparticles. It can be applied in various fields, including colorimetric humidity sensors, anti-counterfeiting applications, and high-resolution displays.
Article
Materials Science, Multidisciplinary
Yongju Kim, Gang Hee Gu, Peyman Asghari-Rad, Jaebum Noh, Junsuk Rho, Min Hong Seo, Hyoung Seop Kim
Summary: The present study introduces a finite element method (FEM)-based simulation coupled with an autoencoder-shaped artificial neural network (ANN) model to evaluate the mechanical responses of materials. The simulation generates various load-displacement curves which are validated using experimental results and further processed to extract meaningful datasets. The results demonstrate the ability to accurately obtain stress-strain curves even from noisy experimental data.
MATERIALS TODAY ADVANCES
(2022)
Article
Optics
Joohoon Kim, Dong Kyo Oh, Hongyoon Kim, Gwanho Yoon, Chunghwan Jung, Jaekyung Kim, Trevon Badloe, Hyunjung Kang, Seokwoo Kim, Younghwan Yang, Jihae Lee, Byoungsu Ko, Jong G. Ok, Junsuk Rho
Summary: This study demonstrates a high-efficiency hologram fabrication method using nanomanufacturing techniques, showing record high theoretical efficiency at a single wavelength and high efficiency over a broad wavelength range. The method offers high throughput and low cost, which could accelerate the practical application of metasurface holography.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Byoungsu Ko, Jaekyung Kim, Younghwan Yang, Trevon Badloe, Jeonghoon Park, Joo Hwan Ko, Minsu Jeong, Hyunjung Kang, Chunghwan Jung, Young Min Song, Junsuk Rho
Summary: This study investigates humidity-responsive nano pixels with a 700 nm resolution, demonstrating full standard RGB gamut coverage and a millisecond-response time. The color pixels are designed as Fabry-Perot etalons and consist of an aluminum mirror substrate, humidity-responsive polyvinyl alcohol spacer, and a top layer of disordered silver nanoparticles. The experiment shows that the volume change of the polyvinyl alcohol reaches up to 62.5% when the relative humidity is manipulated from 20 to 90%. The disordered silver nanoparticle layer enhances the speed of absorption and swelling to the millisecond level.
Article
Nanoscience & Nanotechnology
Chunghwan Jung, Younghwan Yang, Jaehyuck Jang, Trevon Badloe, Taejun Lee, Jungho Mun, Seong-Won Moon, Junsuk Rho
Summary: Structural coloration using metasurfaces has been researched to improve the limitations of conventional color printing, achieving higher resolution, lower toxicity, and increased durability. A switchable structural coloration with polarization-sensitive metasurfaces enables full-colored images to be displayed and hidden, with near-zero scattering when colors are turned-off.
