Article
Chemistry, Physical
Douglas D. de Vargas, Mateus H. Kohler, Rogerio J. Baierle
Summary: The study systematically investigates the structural and electronic properties of h-BN/silicene van der Waals heterostructures under external electric fields and compressive strain. Different phases of silicene show tunable band gap properties, with h-BN layers enhancing both strain and electric field effects on silicene's electronic properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
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
Multidisciplinary Sciences
Deepankur Thureja, Atac Imamoglu, Tomasz Smolenski, Ivan Amelio, Alexander Popert, Thibault Chervy, Xiaobo Lu, Song Liu, Katayun Barmak, Kenji Watanabe, Takashi Taniguchi, David J. Norris, Martin Kroner, Puneet A. Murthy
Summary: This study demonstrates electrically controlled quantum confinement of neutral excitons in 2D semiconductors, achieving confinement below 10 nm. The technique provides an experimental route towards creating scalable arrays of identical single-photon sources and has wide-ranging implications for realizing strongly correlated photonic phases and on-chip optical quantum information processors.
Article
Engineering, Electrical & Electronic
Yingxuan Liu, Chenyu Zhao, Ya-nan Zhang, Guoming Ma, Xuegang Li, Yong Zhao
Summary: The proposed electrically tunable optical fiber device, based on the electro-optic effect of liquid crystal and Mach-Zehnder interferometer, exhibits high sensitivity, low limit of detection, good repeatability, low cost, easy fabrication, and compact size, making it suitable for wavelength-tunable electro-optical devices, photoelectric switches, and electric field sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
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
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
Chemistry, Multidisciplinary
Eva A. A. Pogna, Andrea Tomadin, Osman Balci, Giancarlo Soavi, Ioannis Paradisanos, Michele Guizzardi, Paolo Pedrinazzi, Sandro Mignuzzi, Klaas-Jan Tielrooij, Marco Polini, Andrea C. Ferrari, Giulio Cerullo
Summary: The ability to tune the optical response of single layer graphene via electrostatic gating is crucial for optoelectronic applications.
Article
Chemistry, Multidisciplinary
Furong Fan, Yuanjie Chen, Dong Pan, Jianhua Zhao, H. Q. Xu
Summary: In this study, we experimentally investigated the spin-orbit interaction and quantum transport characteristics in a free-standing InAs nanosheet. By using a dual-gate field-effect device, we were able to independently control the carrier density in the nanosheet and the potential difference across it. Our results showed that by applying a voltage over the dual gate, the electron transport in the nanosheet can be tuned between weak antilocalization and weak localization regimes. We also observed a peak value of the spin-orbit length at which the Rashba-type spin-orbit interaction is suppressed and the Dresselhaus-type spin relaxation can be revealed.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Analytical
Mingce Chen, Zhexun Li, Mao Ye, Taige Liu, Chai Hu, Jiashuo Shi, Kewei Liu, Zhe Wang, Xinyu Zhang
Summary: This paper proposes a prototyped plenoptic camera based on an electrically tunable liquid-crystal device for all-in-focus polarimetric imaging. The proposed imaging architecture can be integrated into a hand-held camera through computer numerical control machining and 3D printing, greatly improving the applicability for outdoor imaging measurements. With the utilization of hexagonal-period liquid-crystal microlens arrays, the light utilization rate is increased by approximately 15%. The proposed camera enables simultaneous plenoptic and polarimetric imaging without any macroscopic moving parts and allows for imaging in a larger depth range than conventional 2D polarimetric cameras.
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
Engineering, Electrical & Electronic
Xuecong Liu, Zhaohui Meng, Kun Zhao, Xinyang Miao, Honglei Zhan, Shanzhe Zhang
Summary: In this study, the laser-induced voltage (LIV) of a commercial coffee was investigated under KrF pulsed laser irradiation. The LIV transient showed three components of fast rise, slow rise, and attenuation. The time dependence of LIV was strongly influenced by bias voltage and laser energy. Higher energy and voltage enhanced LIV, while rise time and FWHM were negatively correlated with energy and voltage. The decay time was significantly shortened by reducing the adjustable resistor parallel to the coffee sample. When an impedance of 10 Omega was applied, the LIV trace was triangular and symmetrical, with response time limited by laser pulse duration. Furthermore, LIV response increased with laser energy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Multidisciplinary Sciences
Ido Schwartz, Yuya Shimazaki, Clemens Kuhlenkamp, Kenji Watanabe, Takashi Taniguchi, Martin Kroner, Atac Imamoglu
Summary: In this study, Moire superlattices in transition metal dichalcogenide bilayers were used as a platform to explore strong correlations with optical spectroscopy. By investigating a MoSe2 homobilayer structure, the researchers demonstrated electric field-controlled manipulation of the ground-state hole-layer pseudospin, as well as the observation of an electrically tunable two-dimensional Feshbach resonance in exciton-hole scattering. These findings may pave the way for the realization of degenerate Bose-Fermi mixtures with tunable interactions.
Article
Optics
Kuangwei DU, Dakai Zhou, Sijia Zhou, Jinfeng Zhang, Qingqing Liu, Xuejian Bai, Qiulan Liu, Youhua Chen, Wenjie Liu, Cuifang Kuang
Summary: This paper presents a quasi-confocal microscopy autofocus system that incorporates an electrically tunable lens (ETL) for achieving differential detection. The ETL changes its focal length to collect differential curves at speeds <300 Hz, enabling selective locking onto desired focal layers and high-speed differential operations near the locked focal plane. By segmenting the system's pupil, the interference between the outgoing and incoming near-infrared beams is eliminated, resulting in a significant improvement in the signal-to-noise ratio. This ultra-sensitive system offers a new implementation pathway, providing a focus drift accuracy better than 1/22 focal depth (& SIM;20 nm @100x objective), which meets the requirements of various microscopy techniques.
Article
Materials Science, Multidisciplinary
Arka Bandyopadhyay, Nesta Benno Joseph, Awadhesh Narayan
Summary: This study reveals that a giant Berry curvature dipole (BCD) can be achieved in non-magnetic elemental honeycomb lattice materials, such as silicene, germanene, and stanene, through the combined effect of a transverse electric field and strain. The topology of the electronic wavefunction switches from a band inverted quantum spin Hall state to a normal insulating state without a band gap closure at the critical electric field strength. This phenomenon can be experimentally verified and leads to the emergence of a switchable nonlinear electrical and thermal Hall effect.
Article
Chemistry, Multidisciplinary
Yaqing Yang, Liwen Zhang, Jun Chen, Xiaohong Zheng, Lei Zhang, Liantuan Xiao, Suotang Jia
Summary: Using NEGF-DFT combined with atomic first-principles calculations, this study theoretically investigates the spin-related photogalvanic effect in anti-ferroelectric bilayer In2Se3 structures. It is found that photoinduced charge-to-spin conversion can be achieved via PGE in In2Se3 due to absence of inversion symmetry and presence of strong spin-orbital interaction. The generated spin-dependent photocurrent is largely spin-polarized and can be tuned by photon energies, polarization, incident angles, and gate voltage transition between two states.
Article
Physics, Multidisciplinary
M. Tahir, P. M. Krstajic, P. Vasilopoulos
Article
Nanoscience & Nanotechnology
M. Tahir
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2018)
Article
Nanoscience & Nanotechnology
Li Wang, Merranda Schmid, Zach N. Nilsson, Muhammad Tahir, Hua Chen, Justin B. Sambur
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Taimur Ahmed, Sruthi Kuriakose, Sherif Abbas, Michelle J. S. Spencer, Md Ataur Rahman, Muhammad Tahir, Yuerui Lu, Prashant Sonar, Vipul Bansal, Madhu Bhaskaran, Sharath Sriram, Sumeet Walia
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Li Wang, Muhammad Tahir, Hua Chen, Justin B. Sambur
Article
Physics, Applied
M. Tahir, P. M. Krstajic, P. Vasilopoulos
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Li Wang, Zach N. Nilsson, Muhammad Tahir, Hua Chen, Justin B. Sambur
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
M. Zubair, P. Vasilopoulos, M. Tahir
Summary: We investigate the electronic dispersion and transport properties of graphene/WSe2 heterostructures in the presence of spin-orbit coupling, sublattice potential, and off-resonant circularly polarized light. We find that the interplay between different perturbation terms leads to inverted spin-orbit coupled bands. At high intensity of the off-resonant light, the inverted band structure transfers into the direct band structure. The valley-Hall conductivity behaves as an even function of the Fermi energy and switches sign when the polarization of the off-resonant light changes. The valley polarization and corresponding spin polarization are affected by the presence of the off-resonant light. Furthermore, the charge Hall conductivity is finite and changes sign with the handedness of the light polarization.
Article
Materials Science, Multidisciplinary
Vassilios Vargiamidis, P. Vasilopoulos, M. Tahir, Neophytos Neophytou
Article
Materials Science, Multidisciplinary
M. Tahir, Olivier Pinaud, Hua Chen
Article
Materials Science, Multidisciplinary
M. Zubair, P. Vasilopoulos, M. Tahir
Article
Materials Science, Multidisciplinary
M. Tahir, P. M. Krstajic, P. Vasilopoulos
Article
Materials Science, Multidisciplinary
M. Zubair, M. Tahir, P. Vasilopoulos, K. Sabeeh
Article
Materials Science, Multidisciplinary
M. Tahir, P. M. Krstajic, P. Vasilopoulos
Article
Materials Science, Multidisciplinary
M. Zubair, M. Tahir, P. Vasilopoulos