scholarly journals Tunable Terahertz Absorption with Optical Tamm State in the Graphene-Bragg Reflector Configuration

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Shuai Wang ◽  
Guimei Li ◽  
Yanhong Zou
Keyword(s):  
Fermi Energy ◽  
High Performance ◽  
Optoelectronic Devices ◽  
Dielectric Constants ◽  
Bragg Reflector ◽  
Absorption Peak ◽  
Perfect Absorption ◽  
Terahertz Absorption ◽  
Tamm State ◽  
Specific Incident

Tunable terahertz absorption in the interface between graphene and dielectric Bragg reflector (DBR) has been numerically demonstrated. The near perfect absorption mainly originates from the enhancement of the electric field owing to the excitation of the optical Tamm state (OTS) at the interface between graphene and dielectric Bragg mirror. It has been found that the absorption peak occurs at specific incident angles, which can be employed for realizing the frequency and angular absorbers. Further, we demonstrate that the position of the absorption peak can be tuned by changing the Fermi energy of graphene. Moreover, the behaviors of the near perfect absorption are strongly related to the dielectric constants and thicknesses of the surrounding dielectrics. The tunability of graphene-DBR structure absorption may help to find favorable applications for the realization of high-performance graphene optoelectronic devices.

scholarly journals High-performance Tunable Multichannel Absorbers Couple with Graphene-based Grating and Dual-Tamm Plasmonic Structures

2021 ◽  
Author(s):  
Jinlei Hu ◽  
Zhengda Hu ◽  
Jicheng Wang ◽  
Aliaksei Balmakou ◽  
Sergei Khakhomov ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Potential ◽  
Grating Period ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Plasmonic Structures ◽  
Resonant Modes ◽  
Tamm State ◽  
High Level ◽  
Absorption Filter

Abstract We present a hybrid Tamm system targeting the tunable multichannel absorber. The proposed optical absorber is analyzed and investigated by using the transfer matrix method (TMM). The numerical and theoretical studies show that the four perfect absorption peaks are generated by two types of resonant modes excited in the structure, which can be reasonably explained by the guide-mode resonance (GMR) and optical Tamm state (OTS). More importantly, the strong interaction between the two modes gives rise to mode hybridization by adjusting the grating period. Furthermore, the active modulation of the GMR-based peak can be manipulated discretely by tuning the polarization angle or continuously by changing the chemical potential of graphene. The presented optical absorption filter will meet high level of effectiveness in developing high-performance optoelectronic devices.

High Performance Optoelectronic Devices Based on Bright Perovskite Nanocrystals Synthesized at Room Temperature

2018 ◽  
Author(s):  
Sotirios Christodoulou ◽  
Francesco Di Stasio ◽  
Santanu Pradhan ◽  
Inigo Ramiro ◽  
Yu Bi ◽  
...  
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Optoelectronic Devices ◽  
Perovskite Nanocrystals

Versatile Solution‐Processed Organic–Inorganic Hybrid Superlattices for Ultraflexible and Transparent High‐Performance Optoelectronic Devices

2021 ◽  
pp. 2103285
Author(s):  
Minh Nhut Le ◽  
Kang‐Jun Baeg ◽  
Kyung‐Tae Kim ◽  
Seung‐Han Kang ◽  
Byung Doo Choi ◽  
...  
Keyword(s):  
High Performance ◽  
Optoelectronic Devices ◽  
Solution Processed ◽  
Inorganic Hybrid

scholarly journals Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Zhendong Yan ◽  
Chaojun Tang ◽  
Guohua Wu ◽  
Yumei Tang ◽  
Ping Gu ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Narrow Band ◽  
Label Free ◽  
Hybrid Mode ◽  
Perfect Absorption ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Silver Substrate ◽  
Hole Arrays

Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.

Effective Application of Magnetic Material Based on Metamaterial Absorber

2013 ◽  
Vol 774-776 ◽  
pp. 907-912
Author(s):  
Hui Bin Zhang ◽  
Li Wei Deng ◽  
Nan Zhang ◽  
Pei Heng Zhou ◽  
Jian Liang Xie ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Design Method ◽  
Copper Wire ◽  
Wire Array ◽  
Magnetic Loss ◽  
Peak Position ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Perfect Absorption ◽  
Effective Application

We simulate, fabricate and measure a microwave absorber by introducing metamaterial design method to magnetic material. The proposed absorber is composed of periodic copper wire array, magnetic material coated on copper wires, a foam substrate and a bottom metal plane. The results show a nearly perfect absorption peak around 8.7GHz (simulated) and 7.6GHz (measured). Even though the electric and magnetic field distribution indicate that the absorption is a typical metamaterial absorption, the power loss is neither Ohmic nor dielectric loss but magnetic loss, which is different from typical metamaterial absorber. The skillful introduction of the magnetic loss improves the absorption performance, including the absorption bandwidth and intensity. The designed absorber shows an effective application of the magnetic material, which is only 1/60000 volume proportion of the total absorber. Dependences of the absorption on frequency and the coating volume of the magnetic material manifest that the coated magnetic material can adjust the absorption peak position and intensity. The absorber can be an attractive candidate of electromagnetic wave absorber.

scholarly journals Graphene-Based Semiconductor Heterostructures for Photodetectors

Micromachines ◽  
2018 ◽  
Vol 9 (7) ◽  
pp. 350 ◽  
Author(s):  
Dong Shin ◽  
Suk-Ho Choi
Keyword(s):  
Optical Properties ◽  
High Performance ◽  
Optoelectronic Devices ◽  
Semiconductor Heterostructures ◽  
Device Physics ◽  
Electrical And Optical Properties ◽  
Design Performance ◽  
Future Challenges ◽  
Transparent Conductive Electrodes

Graphene transparent conductive electrodes are highly attractive for photodetector (PD) applications due to their excellent electrical and optical properties. The emergence of graphene/semiconductor hybrid heterostructures provides a platform useful for fabricating high-performance optoelectronic devices, thereby overcoming the inherent limitations of graphene. Here, we review the studies of PDs based on graphene/semiconductor hybrid heterostructures, including device physics/design, performance, and process technologies for the optimization of PDs. In the last section, existing technologies and future challenges for PD applications of graphene/semiconductor hybrid heterostructures are discussed.

Oriented Quasi-2D Perovskites for High Performance Optoelectronic Devices

2018 ◽  
Vol 30 (51) ◽  
pp. 1804771 ◽  
Author(s):  
Rong Yang ◽  
Renzhi Li ◽  
Yu Cao ◽  
Yingqiang Wei ◽  
Yanfeng Miao ◽  
...  
Keyword(s):  
High Performance ◽  
Optoelectronic Devices

scholarly journals Defect Engineering in 2D Materials: Precise Manipulation and Improved Functionalities

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Jie Jiang ◽  
Tao Xu ◽  
Junpeng Lu ◽  
Litao Sun ◽  
Zhenhua Ni
Keyword(s):  
High Performance ◽  
2D Materials ◽  
Optoelectronic Devices ◽  
Deep Understanding ◽  
Building Blocks ◽  
Research Progress ◽  
Defect Engineering ◽  
Plasma Chemical ◽  
Design And Optimization ◽  
Novel Structure

Two-dimensional (2D) materials have attracted increasing interests in the last decade. The ultrathin feature of 2D materials makes them promising building blocks for next-generation electronic and optoelectronic devices. With reducing dimensionality from 3D to 2D, the inevitable defects will play more important roles in determining the properties of materials. In order to maximize the functionality of 2D materials, deep understanding and precise manipulation of the defects are indispensable. In the recent years, increasing research efforts have been made on the observation, understanding, manipulation, and control of defects in 2D materials. Here, we summarize the recent research progress of defect engineering on 2D materials. The defect engineering triggered by electron beam (e-beam), plasma, chemical treatment, and so forth is comprehensively reviewed. Firstly, e-beam irradiation-induced defect evolution, structural transformation, and novel structure fabrication are introduced. With the assistance of a high-resolution electron microscope, the dynamics of defect engineering can be visualized in situ. Subsequently, defect engineering employed to improve the performance of 2D devices by means of other methods of plasma, chemical, and ozone treatments is reviewed. At last, the challenges and opportunities of defect engineering on promoting the development of 2D materials are discussed. Through this review, we aim to build a correlation between defects and properties of 2D materials to support the design and optimization of high-performance electronic and optoelectronic devices.

scholarly journals Hybrid Metamaterials Perfect Absorber and Sensitive Sensor in Optical Communication Band

2021 ◽  
Vol 9 ◽  
Author(s):  
Xuehan Liu ◽  
Keyang Li ◽  
Zhao Meng ◽  
Zhun Zhang ◽  
Zhongchao Wei
Keyword(s):  
Optical Communication ◽  
Electromagnetic Waves ◽  
Incident Angle ◽  
Silicon Layer ◽  
Resonance Wavelength ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Perfect Absorber ◽  
Perfect Absorption

A subwavelength metamaterial perfect absorber (MPA) in optical communication band was proposed and tested using the finite-difference time-domain method. The absorber is periodic and comprises a top layer of diamond silicon surrounded by L-shaped silicon and a gold layer on the substrate. It can achieve dual-band perfect absorption, and one of the peaks is in the optical communication band. By changing the gap (g) between two adjacent pieces of L-shaped silicon, and the thickness (h) of the silicon layer, the resonance wavelength of absorption peak can be tuned. When the incident electromagnetic wave entered the absorber, the metamaterial absorber could almost completely consume the incident electromagnetic waves, thereby achieving more than 99% perfect absorption. The absorption peak reaches 99.986% at 1310 nm and 99.421% at 1550 nm. Moreover, the MPA exposed to different ambient refraction indexes can be applied as plasma sensors, and can achieve multi-channel absorption with high figure of merit (FOM*) value and refractive index (RI) sensitivity. The FOM* values at 1310 nm and 1550 nm are 6615 and 168, respectively, and both resonance peaks have highly RI sensitivity. The results confirm that the MPA is a dual-band, polarization-independent, wide-angle absorber and insensitive to incident angle. Thence it can be applied in the fields of optical communication, used as a light-wave filter and plasma sensor, and so on.

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