Article
Chemistry, Multidisciplinary
Daeik Kim, Jaeyeon Yu, Gerhard Boehm, Mikhail A. Belkin, Jongwon Lee
Summary: Nonlinear optical metasurfaces provide a new approach to perform frequency mixing at a sub-wavelength scale, overcoming the phase-matching constraints of bulk nonlinear crystals and allowing for control of local nonlinear response on the metasurface. By combining dielectric resonators and lattice resonance, we experimentally demonstrate a new design approach for dielectric inter-subband polaritonic metasurfaces, achieving higher power conversion efficiency in second-harmonic generation.
Article
Physics, Applied
Yang Liu, Jianbang Zhou, Qi Chang, Ji Liu, Jinzu Ji, Li-Hua Shao
Summary: This study has realized a transparent and electrically tunable wave-absorbing metamaterial for stealth technology and electromagnetic protection. The main part of this material adopts a sandwich structure consisting of two layers of indium tin oxide (ITO) and one layer of glass in between. The wave-absorbing performance of the material can be electronically tunable by changing the applied voltage, and it has a wide effective operating frequency range. The metamaterial also has excellent electromagnetic shielding effectiveness.
APPLIED PHYSICS LETTERS
(2022)
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
Optics
Pei-Jung Wu, Wei-Cheng Tsai, Chan-Shan Yang
Summary: In this study, an electrically tunable multi-band terahertz (THz) metamaterial filter based on graphene and multiple-square-loop structures was designed. The structure consists of multiple metal square loops of different sizes, which correspond to different THz frequencies, achieving the expected efficacy of a multi-band wave filter. By sweeping external voltages, the capability of the high-sensitivity THz filter can be modulated from single-band to multi-band filtering by changing graphene's Fermi levels. This hybrid THz wave filter study shows promise for the development of selecting channels in THz and 6G communications.
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
Engineering, Civil
Chang Wang, Rui Li, Zicai Zhu, Jiu Hui Wu, Fuyin Ma
Summary: This study introduces an electrically driven laminated active acoustic metamaterial with PVC plasticization, which achieves excellent sound-damping performance and improved sound insulation performance under the action of an electric field. This structure provides a new way of adjustable sound insulation and has potential applications in heavy equipment such as automobiles.
ENGINEERING STRUCTURES
(2022)
Article
Physics, Multidisciplinary
Shaowen Chen, Minhao He, Ya-Hui Zhang, Valerie Hsieh, Zaiyao Fei, K. Watanabe, T. Taniguchi, David H. Cobden, Xiaodong Xu, Cory R. Dean, Matthew Yankowitz
Summary: Twisted monolayer-bilayer graphene (tMBG) systems exhibit various correlated metallic and insulating states, as well as topological magnetic states. The phase diagram of tMBG can be switched under different perpendicular electric fields, providing a tunable platform for investigating correlated and topological states.
Article
Physics, Condensed Matter
K. A. Rodriguez-Magdaleno, A. Turkoglu, F. Ungan, M. E. Mora-Ramos, J. C. Martinez-Orozco
Summary: In this study, the electronic structure and inter-subband absorption coefficient of symmetric double n-type delta-doped GaAs quantum well were theoretically investigated, considering the effect of donor impurity atoms. It was found that physical properties were more sensitive to inter-well separation distance than to delta-doping density. The presence of donor impurity atoms induced a blue-shift in the optical response, affecting the location of the inter-subband absorption coefficient.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Hui Bai, Xianli Su, Qingjie Zhang, Ctirad Uher, Xinfeng Tang, Jinsong Wu
Summary: A new multipolar antiferroelectric semiconductor Cu2Se has been identified recently, which exhibits spontaneous and localized antiferroelectric polarization along multiple directions and can be switched by an applied electric field, showing great potential in various applications.
Article
Materials Science, Multidisciplinary
Md Tarikul Islam, Ayed Al Sayem, Mohammad Istiaque Reja
Summary: In this article, a novel tunable semiconductor metamaterial based on graphene is proposed, which can effectively tune the long wavelength infrared region of the electromagnetic spectrum by changing the chemical potential of graphene. This unique structure simplifies the tuning process without needing to modify the structural properties or vary the doping concentration of the semiconductor.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Jia-Xin Xiong, Shan Guan, Jun-Wei Luo, Shu-Shen Li
Summary: Contrary to conventional wisdom, a strong and tunable k-linear Rashba SOC has been discovered in Ge/Si semiconductor quantum wells, originating from a combination of heavy-hole-light-hole mixing and direct dipolar coupling to the external electric field. Ge/Si QWs oriented in the [110] direction exhibit a much stronger linear Rashba SOC compared to their [001] counterparts, making them an excellent platform for large-scale quantum computation.
Review
Polymer Science
Shubhangi Shukla, Prem C. Pandey, Roger J. Narayan
Summary: This review summarizes the use of nanocrystal-based photocatalysts as quantum photoinitiators and their potential applications and prospects in polymerization reactions.
Article
Chemistry, Multidisciplinary
Thomas Kanne, Dags Olsteins, Mikelis Marnauza, Alexandros Vekris, Juan Carlos Estrada Saldana, Sara Loric, Rasmus D. Schlosser, Daniel Ross, Szabolcs Csonka, Kasper Grove-Rasmussen, Jesper Nygard
Summary: The core platform of several recent quantum device proposals relies on parallel 1D semiconductor channels connected by a superconducting strip, utilizing Andreev processes or topological effects. A strategy for synthesizing double InAs nanowires using III-V molecular beam epitaxy is presented, allowing for the deposition of a superconducting layer onto nanowires without breaking the vacuum in order to ensure pristine interfaces between the superconductor and the semiconductor nanowires. The method demonstrates the utility of high yield merged or separate parallel nanowires with full or half-shell superconductor coatings in complex quantum devices through electron transport measurements.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
A. Beheshti Asl, D. Pourkhalil, A. Rostami, H. Mirtaghioglu
Summary: The proposed metamaterial absorber based on graphene can adjust its center frequency by changing the chemical potential of graphene, and increase the bandwidth by adding more cylinders in the unit cell. The absorber's frequency response is wider and the center frequency is adjustable by increasing the number of graphene layers.
JOURNAL OF COMPUTATIONAL ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Dongwon Shin, Hyeonbeom Kim, Sung Ju Hong, Sehwan Song, Yeongju Choi, Youngkuk Kim, Sungkyun Park, Dongseok Suh, Woo Seok Choi
Summary: Graphene and LaCoO3 hybrid heterostructure exhibits electrically tunable spin-exchange splitting, providing an opportunity for spin polarization control in spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
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)
Correction
Multidisciplinary Sciences
Justus Bohn, Ting Shan Luk, Craig Tollerton, Sam W. Hutchings, Igal Brener, Simon Horsley, William L. Barnes, Euan Hendry
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Polina P. Vabishchevich, Aleksandr Vaskin, Nicholas Karl, John L. Reno, Michael B. Sinclair, Isabelle Staude, Igal Brener
Summary: In this study, a tunable Mie resonant metasurface based on a diffractive array of semiconductor resonators was designed for ultrafast all-optical switching. By balancing dipolar and quadrupolar Mie resonances, the metasurface can achieve radiation into different diffraction orders and demonstrate fast switch responses. The metasurface's temporal response is governed by thermo-optic effects at higher pump fluences.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Sylvain D. Gennaro, Michael Goldflam, D. Bruce Burckel, Jeeyoon Jeong, Michael B. Sinclair, Igal Brener
Summary: This study demonstrates the fabrication of dielectric metasurfaces with vertically oriented dielectric resonators using membrane projection lithography and characterizes their properties experimentally. The results show that multipolar modes seen in the unsupported array persist in the supported array, but the overall behavior is more complicated due to the scaffold.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(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
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
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.
