Explanipedia

Tunable multi-frequency exceptional points in non-Hermitian terahertz metasurfaces Open

Xianghui Hou, F. S. Deng, Zhihua Han, Yumeng Ma, Chenglong Wang , et al. · 2025

Exceptional points (EPs) in non-Hermitian metasurfaces have garnered considerable attention due to their unique advantages in cutting-edge applications such as ultra-sensitive sensing and unidirectional reflectionlessness. However, existin…

Observation of tunable polarization states evolution in bound states in the continuum based on terahertz metasurfaces Open

Yumeng Ma, F. S. Deng, Ke Ma, Xianghui Hou, Zhihua Han , et al. · 2025

Bound states in the continuum (BICs) are unique optical modes characterized by infinite quality (Q) factors and a topological vortex configuration. The introduction of chiral perturbations transforms BICs into chiral quasi-BICs with high-Q…

Electro-Optical Modulation in High Q Metasurface Enhanced with Liquid Crystal Integration Open

Ruoying Kanyang, Cizhe Fang, Qiyu Yang, Yao Shao, Genquan Han , et al. · 2022

Electro-optical tuning metasurfaces are particularly attractive since they open up routes for dynamic reconfiguration. The electro-optic (EO) modulation strength essentially depends on the sensitivity to the EO-induced refractive index cha…

Efficient Second‐Harmonic Generation from Silicon Slotted Nanocubes with Bound States in the Continuum Open

Cizhe Fang, Qiyu Yang, Qingchen Yuan, Linpeng Gu, Xuetao Gan , et al. · 2022

Optical materials with centrosymmetry, such as silicon and germanium, are unfortunately absent of second‐order nonlinear optical responses, hindering their developments in efficient nonlinear optical devices. Here, a design with an array o…

Actively Tunable Fano Resonance Based on a Bowtie-Shaped Black Phosphorus Terahertz Sensor Open

Yan Huang, Yan Liu, Yao Shao, Genquan Han, Jincheng Zhang , et al. · 2021

An ultrasensitive Terahertz (THz) sensor consisting of the sub-wavelength bowtie black phosphorus (BP) and an annular gold (Au) ring is proposed. The interference between the resonance generated by the bowtie BP and the Au ring creates a F…

High-<i>Q</i> resonances governed by the quasi-bound states in the continuum in all-dielectric metasurfaces Open

Cizhe Fang, Qiyu Yang, Qingchen Yuan, Xuetao Gan, Jianlin Zhao , et al. · 2021

The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasurfaces originate from symmetry-protected bound states in the…

Rabi splitting obtained in a monolayer BP-plasmonic heterostructure at room temperature Open

Yan Huang, Yan Liu, Yao Shao, Genquan Han, Jincheng Zhang , et al. · 2020

Hybrid exciton states can be formed under the strong coupling of plasmons excited by metal nanostructures and excitons. Because of the large exciton binding energy, black phosphorus (BP) is an ideal platform to investigate the strong coupl…

Active tuning of the hybridization effects of mid-infrared surface plasmon resonance in a black phosphorus sheet array and a metal grating slit Open

Yan Huang, Yan Liu, Cizhe Fang, Yao Shao, Genquan Han , et al. · 2019

In this paper, the absorption characteristics of a hybrid structure composed of a black phosphorus (BP) nanostrip array based on localized surface plasmon resonance (LSPR) and a metal grating slit structure have been analyzed systematicall…

Nanostructured multiple-layer black phosphorus photodetector based on localized surface plasmon resonance Open

Yan Huang, Xinyi Liu, Yan Liu, Yao Shao, Siqing Zhang , et al. · 2019

In this paper, we propose a 20-layer black phosphorus (BP) photodetector based on a nanoscale plasmonic grating structure. Different grating materials are compared to optimize the absorption. The optical characteristics of the BP photodete…

Localized plasmon resonances for black phosphorus bowtie nanoantennas at terahertz frequencies Open

Cizhe Fang, Yan Liu, Genquan Han, Yao Shao, Jincheng Zhang , et al. · 2018

In this work, a periodic bowtie structure based on black phosphorus (BP) is theoretically proposed and characterized. It is demonstrated that localized surface plasmons can be excited in the BP nanoantennas at terahertz (THz) frequencies. …

Buffer-Free GeSn with High Relaxation Degree Grown on Si(001) Substrate for Photodetection Open

Cizhe Fang, Yan Liu, Yibo Wang, Jibao Wu, Genquan Han , et al. · 2018

In this paper, buffer-free germanium–tin (GeSn) films on Si(001) grown by molecular beam epitaxy are characterized. GeSn layers show high thermal stability under complementary metal–oxide–semiconductor processing conditions. The experiment…

Rainbow trapping and releasing in InSb graded subwavelength grooves by thermal tuning at the terahertz range Open

Ruoying Kanyang, Fan Zhang, Genquan Han, Yan Liu, Yao Shao , et al. · 2018

Research in terahertz (THz) science and technology has been booming in view of its potential application in a variety of light-matter interaction areas. Intrinsic indium antimonide (InSb) is an excellent tunable candidate material that sup…

Rainbow Trapping in Highly Doped Silicon Graded Grating Strip at the Terahertz Range Open

Yan Liu, Ruoying Kanyang, Genquan Han, Yao Shao, Cizhe Fang , et al. · 2018

In this paper, we propose surface plasma polaritons (SPPs) propagating along the structure of grating grooves based on highly doped silicon, which exhibits better performance of exciting SPPs than metal at low frequency (e.g., microwaves, …

Theoretical Investigation of Tensile-Strained GeSn/SiGeSn Multiple Quantum Well Laser Wrapped in Si 3N4 Liner Stressor Open

Yan Liu, Cizhe Fang, Xiqi Gao, Genquan Han, Qingfang Zhang , et al. · 2018

A tensile-strained GeSn/SiGeSn multiple quantum well (MQW) laser wrapped in Si₃N₄ liner stressor is designed and characterized theoretically. A biaxial tensile strain is introduced into the GeSn/SiGeSn MQW laser by th…

Germanium-tin alloys: applications for optoelectronics in mid-infrared spectra Open

Fang Cizhe, Yan Liu, Qingfang Zhang, Genquan Han, Xi Gao , et al. · 2018

We summarize our work of the optoelectronic devices based on Germanium-tin (GeSn) alloys assisted with the Si3N4 liner stressor in mid-infrared (MIR) domains. The device characteristics are thoroughly analyzed by the strain distribution, b…

Absorption Enhancement for Black Phosphorus Active Layer Based on Plasmonic Nanocavity Open

Cizhe Fang, Yan Liu, Genquan Han, Yao Shao, Yan Huang , et al. · 2017

In this letter, we propose a strategy to enhance absorption in the black phosphorus absorber based on a nanocavity structure. By introducing a porous silver layer, an enhanced broadband light absorption can be obtained in the spectral rang…

Simulation investigation of strained black phosphorus photodetector for middle infrared range Open

Siqing Zhang, Yan Liu, Yao Shao, Cizhe Fang, Genquan Han , et al. · 2017

In this paper, we design the uniaxially and biaxially strained black phosphorus (BP) photodetectors. Different strains applied in the zigzag or armchair direction can effectively tune the direct band gap of 5-layer of BP. The optical field…

Engineering rainbow trapping and releasing in ultrathin THz plasmonic graded metallic grating strip with thermo-optic material Open

Yan Liu, Yibo Wang, Genquan Han, Yao Shao, Cizhe Fang , et al. · 2017

In this paper, we propose an ultrathin THz plasmonic metallic strip based on graded grating structure with thermo-optic material, which exhibits a strong engineering of trapping and releasing electromagnetic waves in terahertz regimes. The…

Ultrathin Corrugated Metallic Strips for Ultrawideband Surface Wave Trapping at Terahertz Frequencies Open

Yan Liu, Cizhe Fang, Genquan Han, Yao Shao, Yan Huang , et al. · 2016

The dispersion properties of the ultrathin spoof slow-wave plasmonic waveguide based on different ultrathin metal strip grooves have been simulated using the finite element method. The dispersion characteristics of the four different surfa…

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