Article
Thermodynamics
Haotuo Liu, Qing Ai, Ming Xie
Summary: This paper presents a numerical analysis of an innovative narrowband absorber with a VO2-graphene-based Fabry-Perot multilayer structure, which utilizes thermally and electrically tunable methods to regulate light absorption in the mid-infrared region. The findings show a maximum thermal modulation of spectral absorbance ranging from 0.068 to 0.999, with Fabry-Perot resonance as the primary cause of strong light absorption. By changing the dimensions of the absorber layers, the spectral selectivity of the absorber can be varied, and the impact of incidence angle and gate voltage on spectral absorbance was also analyzed. Additionally, the sensing performance of the multilayer structure was investigated, providing valuable insights for designing tunable high-performance optoelectronic devices in the future.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Multidisciplinary Sciences
Hai Hu, Na Chen, Hanchao Teng, Renwen Yu, Mengfei Xue, Ke Chen, Yuchuan Xiao, Yunpeng Qu, Debo Hu, Jianing Chen, Zhipei Sun, Peining Li, F. Javier Garcia de Abajo, Qing Dai
Summary: Negative refraction is achieved using hybrid topological polaritons in van der Waals heterostructures, allowing for gate-tunable manipulation of mid-infrared radiation. Wide-angle negatively refracted polaritons are observed in partially decorated a-MoO3 films with graphene, demonstrating reversible nanoscale focusing. This technique offers possibilities for electrically tunable super-resolution imaging, nanoscale thermal manipulation, enhanced molecular sensing, and on-chip optical circuitry.
Article
Chemistry, Physical
Xingxing Zhang, Xiangdong Gao, Yubing Dong, Yongqing Wu, Deng Duan, Xiang Zhao, Xiaomin Li
Summary: In this study, Mg2+ was doped in nanoporous SiO2 nano-particles to modulate the infrared emissivity of intrinsic SiO2. The effects of Mg doping on the crystallinity, morphology, infrared emissivity, and radiative cooling properties were investigated. The results showed that Mg doping induced cristobalite na-nocrystals, transformed the morphology, and improved the infrared emissivity. The Mg-doped SiO2 coatings exhibited high solar reflectivity and significantly improved radiative cooling capacity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kabir Hossain, Thennarasan Sabapathy, Muzammil Jusoh, Ping Jack Soh, Mohd Haizal Jamaluddin, Samir Salem Al-Bawri, Mohamed Nasrun Osman, R. Badlishah Ahmad, Hasliza A. Rahim, Mohd Najib Mohd Yasin, Nitin Saluja
Summary: This study presents an electrically tunable textile-based metamaterial (MTM) with left-handed characteristics and negative permittivity and permeability within specific frequency ranges. The proposed MTM unit cell and arrays were independently studied and experimentally verified, showing tunable transmission coefficient and dynamic operation potential for microwave wearable applications.
Article
Nanoscience & Nanotechnology
Wei Yao, Linlong Tang, Jinpeng Nong, Jun Wang, Jun Yang, Yadong Jiang, Haofei Shi, Xingzhan Wei
Summary: A metamaterial composed of graphene-Al2O3-graphene stacks is proposed and demonstrated in this study, allowing for the electric modulation of both graphene layers simultaneously with absorption modulation of over 50% and a bandwidth of 3.55 μm. The optical behaviors of the tunable metamaterial can be influenced by various factors, including incident polarization, dielectric thickness, and the Fermi energy of graphene.
Article
Engineering, Mechanical
Zhonglei Shen, Xiangdong Fang, Shengnan Li, Liuyang Zhang, Xuefeng Chen
Summary: The paper proposes a mechanically reconfigurable and electrically tunable THz chiral metamaterials, demonstrating control of circular dichroism and quarterwave-plate behavior through adjusting folding angle and Fermi energy level of graphene origami.
EXTREME MECHANICS LETTERS
(2022)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Materials Science, Multidisciplinary
Henrik Parsamyan, Hovhannes Haroyan, Khachatur Nerkararyan
Summary: Investigation on a metamaterial composed of thin metallic strips as an efficient broadband absorber in the mid-infrared spectrum is conducted. Matching between dielectric and geometrical properties of individual elements is critical for high absorption. The results of detailed theoretical analysis and design of the metamaterial structure show that it exhibits excellent broadband absorption and can be tuned by varying individual element parameters.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Patinharekandy Prabhathan, Kandammathe Valiyaveedu Sreekanth, Jinghua Teng, Ranjan Singh
Summary: This study proposes a novel approach to chalcogenide phase change material (PCM)-incorporated steganographic nano-optical coatings (SNOC) for optical steganography. The SNOC design combines a broad-band and a narrow-band absorber made up of PCMs to achieve tunable optical Fano resonance in the visible wavelength, which is a scalable platform for accessing the full-color range. The study demonstrates the dynamic tuning of the Fano resonance line width by switching the structural phase of PCM, providing high-purity colors. For steganography applications, the SNOC cavity layer is divided into an ultralow loss PCM and a high index dielectric material with identical optical thickness, enabling the fabrication of electrically tunable color pixels on a microheater device.
Article
Mechanics
Giacomo Elefante, Maria Laura De Bellis, Andrea Bacigalupo
Summary: An electrically-tunable metamaterial with active control of damped elastic waves is designed, where a dissipative electric circuit is used to adjust the impedance/admittance. A new derationalization strategy is proposed to solve the difficulty caused by the presence of a dissipative circuit, by exploiting an LU factorization of the matrix collecting the rational terms. The strategy is successfully applied to a three-phase metamaterial shunted by a series RLC circuit with rational admittance.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Xiaoyong He, Fangting Lin, Feng Liu, Wangzhou Shi
Summary: Based on 3D Dirac semimetals, the tunable propagation properties of quasi-bound in continuum resonance have been investigated. The results show that by altering the rotation angle of elliptical resonator, a sharp BIC transmission dip is observed. The DSM Fermi level and the configuration of resonators also affect the BIC resonance, with the Fermi level significantly influencing the resonance and modifying the configuration causing additional transmission dips.
Article
Optics
Guan-Fu Sung, Po-Chang Wu, Victor Ya Zyryanov, Wei Lee
Summary: Cholesteric liquid crystals are important soft materials for display and sensing technologies, with unique optical and thermal properties susceptible to external perturbations. A novel dual-mode CLC device as smart glass allows for self-adaptive transparency to temperature and fully on-demand, electrically controlled functions. The material can be reversibly modulated between transparent and opaque states, partially blocking unwanted thermal radiation in the optically transparent state.
PHOTONICS RESEARCH
(2021)
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
Materials Science, Multidisciplinary
Angela J. Cleri, J. Ryan Nolen, Konstantin G. Wirth, Mingze He, Evan L. Runnerstrom, Kyle P. Kelley, Joshua Nordlander, Thomas Taubner, Thomas G. Folland, Jon-Paul Maria, Joshua D. Caldwell
Summary: Strongly anisotropic materials exhibit hyperbolic behavior in propagating light, and this behavior can also be engineered in hyperbolic metamaterials (HMMs). This study observed tunable hyperbolic modes in high- and low-doped cadmium oxide (CdO) superlattices with low losses, enabling real-space imaging of hyperbolic plasmon polaritons. CdO HMMs with tunability and low losses offer design capabilities for applications in on-chip photonics, super-resolution imaging, enhanced emission, and quantum nanophotonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wen-Zhuang Ma, Jing Liu, Wei Chen, Yu-Shan Chen, Ping-Ping Zhuang, Xue-Qiu You, Xu-Chu Deng, Dong Lin, Zhi-Chun Fan, Yu Gu
Summary: An internally and externally emitting switch for a midinfrared atmospheric window has been preliminarily designed in this study, utilizing a thermally tunable metamaterial emitter with a multilayer metal-dielectric-metal micropyramid structure and thermochromic VO2 spacers. The emitter's hybridization of separate magnetic polaritons, surface plasmon polaritons, and thermal phase-transition characteristics of VO2 enable broad emission and thermal tunability. The structure exhibits warming effects below the phase-change temperature and cooling effects above it, showing potential applications in smart temperature control systems.
RESULTS IN PHYSICS
(2021)
Article
Optics
Ricky Gibson, Ivan Avrutsky, Shivashankar Vangala, Dennis E. Walker, Joshua R. Hendrickson
Summary: A second-order transfer function analysis was performed on plasmonic modes with different quality factors to study the coupling of modes in metal-insulator-metal structures. The asymmetric Fano-like lineshape at resonant crossings was observed in both simulations and angle dependent spectra. By using the pole analysis method, the coupling coefficient for this system was extracted and can be applied to other plasmonic and photonic coupled resonances.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Aleksandr Vaskin, Sheng Liu, Sadhvikas Addamane, Polina P. Vabishchevich, Yuanmu Yang, Ganesh Balarishnan, Michael B. Sinclair, Thomas Pertsch, Igal Brener, Isabelle Staude
Summary: Optical metasurfaces offer control over emission directionality for engineering advanced light sources. Experimental studies on a metasurface with semiconductor nanocylinders and quantum dots show that emission directionality can be manipulated by exciting different resonances, providing insights for designing novel smart light sources.
Article
Multidisciplinary Sciences
Justus Bohn, Ting Shan Luk, Craig Tollerton, Sam W. Hutchings, Igal Brener, Simon Horsley, William L. Barnes, Euan Hendry
Summary: The study focuses on the pump-dependent properties of plasmon resonance in the ENZ region of indium tin oxide (ITO) thin film, demonstrating a thermal switching mechanism and highlighting a previously unisolated two-beam coupling contribution in ENZ nonlinear optics research.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Raktim Sarma, Jiaming Xu, Domenico de Ceglia, Luca Carletti, Salvatore Campione, John Klem, Michael B. Sinclair, Mikhail A. Belkin, Igal Brener
Summary: This study focuses on optimizing the electromagnetic modes in meta-atoms and engineering material nonlinearities at the nanoscale to enhance the efficiency of second-harmonic generation using all-dielectric metasurfaces. By simultaneously optimizing heterostructures and meta-atoms, an all-dielectric polaritonic metasurface with high second-harmonic generation power conversion factor and power conversion efficiencies is experimentally realized. These results open up a new direction for designing efficient nonlinear all-dielectric metasurfaces for classical and quantum light sources.
Article
Materials Science, Multidisciplinary
Dylan Morden, Evan M. Smith, Ivan Avrutsky, Joshua R. Hendrickson, Imad Agha, Shivashankar Vangala
Summary: This paper presents the material characteristics and crystallinity of germanium antimony telluride (GST), and designs and experimentally verifies a transmission filter in the mid-infrared. By gradually increasing the temperature of annealed GST, the amount of crystallinity can be controlled, allowing the refractive index to continuously increase. The GST is integrated into a metal-dielectric sub-wavelength grating, which can actively tune the transmission wavelength and maintain angular independence within a wide range of angles.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Sylvain D. Gennaro, Chloe F. Doiron, Nicholas Karl, Prasad P. Iyer, Darwin K. Serkland, Michael B. Sinclair, Igal Brener
Summary: In this study, we demonstrate the existence of cascaded second-order optical nonlinearities by analyzing second- and third-wave mixing from a highly nonlinear metasurface. We find that the third-wave mixing signal from the cascaded process can be comparable in strength to that from conventional third-harmonic generation, and surface nonlinearities are the dominant mechanism contributing to cascaded second-order nonlinearities in our metasurface.
Article
Nanoscience & Nanotechnology
Lucy L. Hale, Hyunseung Jung, Sylvain D. Gennaro, Jayson Briscoe, C. Thomas Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Oleg Mitrofanov
Summary: The ultrafast optical excitation of specific materials can generate broadband terahertz pulses, leading to the development of terahertz time-domain spectroscopy. Optical metasurfaces have relaxed material requirements by enhancing terahertz generation through the manipulation of local electromagnetic fields. This study demonstrates efficient terahertz generation in a nanostructured GaAs metasurface, suggesting the potential for engineering semiconductor metasurfaces as versatile terahertz radiation emitters.
Article
Optics
Rakim Sarma, Jiaming Xu, Domenico De Ceglia, Luca Carletti, John Klem, Mikhail A. Belkin, Igal Brener
Summary: This work explores second-harmonic generation in all-dielectric metasurfaces and discovers that the control of the nonlinear susceptibility polarity is a crucial factor. By utilizing resonant nonlinearities in semiconductor heterostructures, it is possible to flip and control the polarity of the nonlinear susceptibility of the dielectric medium and couple it with Mie-type photonic modes, thereby enabling control over the second-harmonic radiation pattern and conversion efficiency.
Correction
Nanoscience & Nanotechnology
Lucy L. Hale, Hyunseung Jung, Sylvain D. Gennaro, Jayson Briscoe, C. Thomas Harris, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Oleg Mitrofanov
Article
Multidisciplinary Sciences
Tomas Santiago-Cruz, Sylvain D. Gennaro, Oleg Mitrofanov, Sadhvikas Addamane, John Reno, Igal Brener, Maria Chekhova
Summary: This study demonstrates the generation of entangled photons through spontaneous parametric downconversion in semiconductor metasurfaces with high-quality factor and quasi-bound state in the continuum resonances. The metasurfaces enhance the quantum vacuum field, leading to the emission of nondegenerate entangled photons in multiple narrow resonance bands and over a wide spectral range. By pumping a single resonance or multiple resonances at different wavelengths, multifrequency quantum states, including cluster states, can be generated.
Article
Materials Science, Multidisciplinary
Hyunseung Jung, Lucy L. Hale, Jayson Briscoe, Raktim Sarma, Ting Shan Luk, Sadhvikas J. Addamane, John L. Reno, Igal Brener, Oleg Mitrofanov
Summary: By nanostructuring low temperature grown GaAs into a highly absorbing metasurface, THz photoconductive detection with a pulsed laser at 1.55 μm is achieved, with high sensitivity and large bandwidth. The metasurface has the potential to serve as a universal ultrafast switching element for THz applications, enabling low-cost, turn-key THz systems for a variety of real-world applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Chloe F. Doiron, Igal Brener, Alexander Cerjan
Summary: In this study, a design paradigm based on six-fold rotational symmetry is proposed to create degenerate pairs of symmetry-protected BICs, whose frequency splitting and Q-factors can be independently and predictably controlled.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Lucy L. L. Hale, Zhengtianye Wang, C. Thomas Harris, Igal Brener, Stephanie Law, Oleg Mitrofanov
Summary: Plasmons supported by massless electron surface states in topological insulators (TIs), known as Dirac plasmons, have promising applications in optoelectronics. However, studying Dirac plasmons is challenging due to their confinement to the surface. In this study, aperture near-field spectroscopy was used to investigate localized terahertz (THz) Dirac plasmon resonances in Bi2Se3 ribbon arrays. The combination of THz time-domain spectroscopy and aperture near-field microscopy allowed for sampling of localized Dirac plasmons and mapping of their dispersion, revealing a coupled plasmon-phonon polariton interaction. Aperture near-field spectroscopy provides valuable information for the understanding and development of real-world TI devices.
Article
Physics, Applied
Stefan Zollner, Shivashankar R. Vangala, Vladimir L. Tassev, Duane Brinegar, Samuel Linser
Summary: The infrared dielectric function of thick GaAs1-xPx alloy layers was studied using Fourier-transform infrared ellipsometry, revealing the presence of GaAs-like and GaP-like optical phonons. The lattice absorption peaks exhibited asymmetric shapes, and the cluster model provided a better fit to the experimental data.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Yuezhen Lu, Lucy L. L. Hale, Abdullah M. M. Zaman, Sadhvikas J. J. Addamane, Igal Brener, Oleg Mitrofanov, Riccardo Degl'Innocenti
Summary: Metamaterial resonators in the terahertz frequency range have proved to be efficient and versatile platforms with applications in integrated optical devices and fundamental research. However, characterizing the modes supported by these subwavelength elements has been challenging, relying on indirect observation of collective far-field transmission/reflection properties of arrays. In this study, we present a broadband time-domain spectroscopic investigation of individual metamaterial resonators using a THz aperture scanning near-field microscope (a-SNOM). The results allow mapping and quantitative analysis of confined modes supported by the resonators, including weakly radiative modes.