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Article
Optics
Qiuxiao Feng et al.
Summary: This study presents two designs of actively switchable terahertz spiral-shaped metamaterial, which can achieve binary encoding and logic operations, and have the potential to be optoelectronic switches and multi-bit programmable devices in the THz spectrum.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Wei-Hsi Lai et al.
Summary: This study proposes a tunable terahertz (THz) metamaterial using the micro-electro-mechanical system (MEMS) technique for pressure sensing application. The structure of this MEMS-based tunable metamaterial (MTM) consists of gold split-ring resonators (SRRs) on a patterned silicon substrate with through Si via (TSV). By changing the angle of the SRR cantilever, the resonances in transverse magnetic (TM) mode and transverse electric (TE) mode can be tuned. These results demonstrate the potential applications of MTM design in pressure and flow rate sensors.
Article
Materials Science, Multidisciplinary
Daoye Zheng et al.
Summary: This study proposes a visible metamaterial composed of a lithium niobate (LiNbO3) nanoring (LNR) structure on a polydimethylsiloxane (PDMS) substrate. By optimizing the geometry configurations, a strong magnetic dipole (MD) resonance is stimulated and other multipole resonances are suppressed, generating single reflection peaks with high efficiency and narrow bandwidths. The stretchable nature of the PDMS substrate enables the LNR metamaterial to be mechanically tuned and responsive to changes in the ambient environment, making it suitable for stretchable electronics, color generation, LiFi filtering, and biochemical sensing applications.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
Xiaocan Xu et al.
Summary: This work presents the integration of terahertz electrical split-ring metamaterial with a microfluidic chip, which exhibits multiple resonances in the THz spectrum and selective trapping of microparticles. The eSRM array arrangement generates various resonant modes and shows high sensitivity to the environmental refractive index. The microparticles are trapped using elliptical barricades on the eSRM surface, and the chip demonstrates trapping and sensing abilities for various applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Binghui Li et al.
Summary: We introduce four types of tunable terahertz metamaterials made of split-ring resonators (SRRs) with different splits and inner movable structures. These designs can achieve different tuning ranges in transverse electric (TE) and transverse magnetic (TM) modes, exhibiting polarization-dependent and polarization-independent characteristics. By increasing the height of the inner movable structure, the resonant frequency of the metamaterials can be tuned. These designs possess anti-vibration and tunable characteristics, which make them potential candidates for high tunability, flexibility, and applicability in THz-wave optoelectronic devices.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Optics
Yuxin Liu et al.
Summary: A reconfigurable metalens with dual-liner-focus (DLF) phase distribution is proposed, which exhibits excellent focus performance at a wavelength of 300 μm in the right circularly polarized (RCP) mode. The focal length of the double-layer reconfigurable metalens with DLF phase distribution can be tuned from 1.48 cm to 2.98 cm, with a high-quality focusing characteristics. Additionally, a metalens with DLF phase distribution is presented to possess polarization controllable bifocal and varifocal characteristics.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Binghui Li et al.
Summary: We propose a design of a tunable terahertz (THz) metamaterial (TTM) with single- and dual-band filtering, polarization-dependent, and switching characteristics. The device is composed of electric split-ring resonators (eSRR) with I-shaped and T-shaped structures on a silicon-on-insulator (SOI) substrate. By controlling the displacement of the middle I-shaped metamaterial along the y-direction and z-direction using electrostatic force, the electromagnetic responses of the TTM can be controlled. The TTM exhibits robustness to the displacement of the I-shaped metamaterial along the y-direction and shows switching characteristics between single and dual resonances in TM mode by moving the I-shaped metamaterial along the z-direction.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Hao Sun et al.
Summary: This article presents a tunable terahertz metamaterial consisting of double connected semicircle-shaped rings and segregated metallic bars. By manipulating the radius of the rings, the resonances can be red-shifted in both TE and TM polarizations. The device shows polarization-dependent characteristics and can be used for single-, dual-, triple-, and quad-resonance switching as well as high-efficiency environmental sensing applications.
Article
Nanoscience & Nanotechnology
Kunye Li et al.
Summary: This paper presents a tunable metamaterial nanograting coupler (MNC) consisting of a one-dimensional surface nanograting coupler, a bottom reflector, and a metamaterial. By introducing a reflector and optimizing nanograting parameters, the spatial coupling efficiency of a single nanograting coupler exceeds 97% at a near-infrared wavelength of 1.43 μm. The metamaterial can be tuned using micro-electro-mechanical system (MEMS) technique, allowing control of the relative height or lateral offset between the metamaterial and coupling nanograting, thus separating the light-emitting efficiency into two different directions. Additionally, the coupling efficiency is as high as 91% at the optical C-band communication window. Therefore, the proposed MEMS-based MNC not only has the potential for coupling optical fibers with high-density integrated optoelectronic chips, but also shows promising application prospects in light path switching, variable optical attenuation, and optical switch.
Article
Optics
Huan Zhao et al.
Summary: This paper proposes a three-layer metallic THz metasurface for multi-channel polarization generation and phase modulation. It demonstrates a vectorial beam generator and a vectorial hologram with eight channels for different linear polarization states. This work contributes to achieving a multi-functional metasurface in the THz band and can benefit THz communication and optical information security.
OPTO-ELECTRONIC ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Xiaocan Xu et al.
Summary: A voltage-controllable device is proposed in this study for CO2 gas sensing application, integrating a VO2-based metamaterial perfect absorber (MPA) and a MEMS microheater. By driving the microheater, the MPA can be heated and exhibit switchable optical properties. This research provides a new approach for sensors, absorbers, switches, and programmable devices in the infrared wavelength range.
Article
Optics
Jin Leng et al.
Summary: The study found that changes in asymmetry significantly impact the Q factor and depth of amplitude modulation of Fano resonance, the carrier concentration of silicon plays a significant role in the intensity of excited Fano resonance, and a uniform graphene layer can effectively modulate Fano resonance.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Rui-Jia Xu et al.
Summary: This study reviews and analyzes the development of MEMS-based metamaterials and their actuators. A comparison of different actuating methods is provided as a guideline for selecting micro-actuators integrated with metamaterials. By utilizing electro-mechanical inputs, MEMS-based metamaterials have the ability to manipulate various parameters of incident electromagnetic waves, offering a wide range of potential applications.
Article
Nanoscience & Nanotechnology
Yicheng Wang et al.
Summary: In this study, a highly efficient broadband visible perfect absorber using plasmonic metasurface is designed and demonstrated. By changing the geometrical parameters, the electromagnetic properties of the absorber are discussed, and excellent absorption performance in the visible spectrum is revealed. The absorber shows great potential in thermal photovoltaics and energy harvesting applications.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Multidisciplinary Sciences
Ruijia Xu et al.
Summary: This article introduces a novel design by integrating MEMS ETA platform and CSM metamaterial to perform opto-logic functions. The reconfigurable and stretchable mechanisms of CSM are optimized by driving different DC bias voltages, allowing tunable optical responses and demonstrating excellent performance in the THz range.
Article
Materials Science, Multidisciplinary
Zhihao Ren et al.
Summary: Photonic integrated circuits (PICs) offer a promising platform for miniaturized on-chip optical systems, with one key aspect being the dense integration of photonic components. This study introduces a bigradient on-chip metalens (BOML) to achieve ultrasmall focal lengths and spot sizes at the subwavelength scale for efficient on-chip focusing in PICs. The BOML design combines gradient geometry and refractive index to optimize performance metrics such as figure-of-merits and numerical aperture, enabling high-density on-chip photonic systems for various applications.
Review
Materials Science, Multidisciplinary
Ke Bi et al.
Summary: All-dielectric metamaterials are a rapidly developing research hotspot in the field of metamaterials, offering low loss and design freedom. The proper choice of fabrication technique is crucial for efficient electromagnetic manipulation. This overview discusses existing fabrication techniques, including methods for different frequency bands and their respective advantages and disadvantages.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Fengdi Zhu et al.
Summary: This study presents a design of electric split-ring resonators (eSRR) with multiple resonant frequencies in the THz range and high Q-factors. The resonances of eSRR can be tuned by changing the gaps within the structure, allowing for stable resonances. The device exhibits optical on and off states in TE and TM modes, showing three resonances at 0.19 THz, 0.43 THz, and 0.68 THz, with the potential for use in sensors, programmable devices, radars, and optical communication applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Peng Lin et al.
Summary: The stretchable metalens proposed in this study can achieve highly tunable focal length and achromatic characteristics by stretching along x and y-axis directions. The focal length remains stable and shows a linear relationship with the change in the period of the metalens. By stretching the period of the metalens, the focal lengths can be tuned in a linear range for incident wavelengths ranging from 480 nm to 660 nm, with a tuning range of over 200% for these wavelengths.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Tao Xu et al.
Summary: The design of electric split-ring metamaterial (eSRM) with tunable terahertz free spectra range (FSR) characteristic allows stable operation in both TE and TM modes, with the ability to tune and switch electromagnetic responses between dual- and quad-resonance. The eSRM demonstrates sensitivity to polarization angle and can be used for sensing applications exposed to different surrounding refraction index, with a sensitivity of 0.457 THz/RIU and average Q-factor and FOM values of 40.65 and 35.47, respectively.
JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
(2021)
Article
Physics, Multidisciplinary
Pengfei Shi et al.
Summary: This study proposed a method for achieving maximum efficiency ET through arbitrary-shaped subwavelength apertures at specific frequencies by designing MTM microstructure using topology optimization. The model is based on the shape of the aperture and optimization of MTM.
Article
Materials Science, Multidisciplinary
Yao Wen et al.
Summary: The proposed tunable perfect meta-absorber (PMA) exhibits perfect absorption, tunable resonance, variable optical attenuation, and switchable polarization-dependence/independence characteristics, making it ideal for sensing applications. With a sensitivity of 1200nm/RIU, the PMA can be used in variable optical attenuators, polarization switches, tunable absorbers, and sensors applications.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Optics
Fengwei Zhan et al.
Article
Optics
Fangyuan Lu et al.
Article
Materials Science, Multidisciplinary
Tao Xu et al.
RESULTS IN PHYSICS
(2020)
Article
Optics
Xinyi Zhang et al.
OPTICS AND LASER TECHNOLOGY
(2020)
Article
Physics, Applied
Ji Luo et al.
APPLIED PHYSICS LETTERS
(2019)
Article
Optics
Ke Bi et al.
PHOTONICS RESEARCH
(2019)
Article
Optics
Yu-Sheng Lin et al.
OPTICS AND LASER TECHNOLOGY
(2019)
Article
Optics
Xiaoyong He et al.
Article
Nanoscience & Nanotechnology
Dinh Hai Le et al.
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Materials Science, Multidisciplinary
Yangbin Yu et al.
RESULTS IN PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Ruijia Xu et al.
RESULTS IN PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Ritesh Kumar Kushwaha et al.
OPTICAL AND QUANTUM ELECTRONICS
(2019)
Article
Materials Science, Multidisciplinary
Zefeng Xu et al.
ADVANCED OPTICAL MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
Fangyuan Lu et al.
RESULTS IN PHYSICS
(2019)
Article
Optics
S. Pagan Mohan Rao et al.
Article
Nanoscience & Nanotechnology
Wei Ting Chen et al.
NATURE NANOTECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
Yu-Sheng Lin
Article
Optics
Yanjiao Zhao et al.
Review
Nanoscience & Nanotechnology
Saman Jahani et al.
NATURE NANOTECHNOLOGY
(2016)
Article
Chemistry, Multidisciplinary
Longqing Cong et al.
ADVANCED MATERIALS
(2015)
Article
Chemistry, Multidisciplinary
Wei Li et al.
ADVANCED MATERIALS
(2014)
Article
Physics, Applied
Yu-Sheng Lin et al.
APPLIED PHYSICS LETTERS
(2014)
Article
Multidisciplinary Sciences
Dianmin Lin et al.
Article
Optics
Andrei Andryieuski et al.
Article
Chemistry, Multidisciplinary
Yanxia Cui et al.
Article
Multidisciplinary Sciences
Jianqiang Gu et al.
NATURE COMMUNICATIONS
(2012)
Article
Physics, Applied
Jiaming Hao et al.
APPLIED PHYSICS LETTERS
(2010)
Article
Materials Science, Multidisciplinary
Marcus Diem et al.
Article
Multidisciplinary Sciences
Jason Valentine et al.
Review
Optics
Vladimir M. Shalaev
Article
Multidisciplinary Sciences
RA Shelby et al.
