Improve optical modulation depth of terahertz wave by monolayers of plasmonic nanoparticles

2016 ◽  
Author(s):  
Tianlong Wen ◽  
Chong Zhang ◽  
Qiye Wen ◽  
Yulan Jing ◽  
Huaiwu Zhang ◽  
...  
Keyword(s):  
Modulation Depth ◽  
Terahertz Wave ◽  
Plasmonic Nanoparticles ◽  
Optical Modulation

scholarly journals Effective Generation of Milliwatt-Level Sub-Terahertz Wave for Nonlinear Response Measurement of Two-Dimensional Material by Optical Heterodyne Technique

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Shuqing Chen ◽  
Zhiqiang Xie ◽  
Junmin Liu ◽  
Yanliang He ◽  
Yao Cai ◽  
...  
Keyword(s):  
Nonlinear Response ◽  
Modulation Depth ◽  
Terahertz Wave ◽  
Saturable Absorption ◽  
Optical Heterodyne ◽  
Two Dimensional ◽  
Response Measurement ◽  
Microwave Source ◽  
Terahertz Band ◽  
Heterodyne Technique

By using optical heterodyne technique, we demonstrated the stable emission of sub-terahertz wave with the frequency ranging from 88 GHz to 101 GHz, which can operate as microwave source for nonlinear response measurement system. Mutual frequency beating of two well-separated sideband signals at a 0.1 THz photo-detector (PD) allows for the generation of sub-terahertz signal. Based on this approach, we have achieved the radiation of 0.1 THz wave with power up to 4 mW. By transmittance measurement, two-dimensional nanomaterial topological insulator (TI: Bi2Te3) shows saturable absorption behaviors with normalized modulation depth of 47% at 0.1 THz. Our results show that optical heterodyne technique could be developed as an effective microwave source generation for nonlinear measurement at sub-terahertz, even terahertz band.

NIR Light Driven Terahertz Wave Modulator with a Large Modulation Depth Based on a Silicon‐PEDOT:PSS‐Perovskite Hybrid System

2020 ◽  
Vol 5 (4) ◽  
pp. 1901090
Author(s):  
Weien Lai ◽  
Chengda Ge ◽  
Hao Yuan ◽  
Qingfeng Dong ◽  
Deren Yang ◽  
...  
Keyword(s):  
Hybrid System ◽  
Modulation Depth ◽  
Terahertz Wave ◽  
Nir Light

Thermo-Electrical Analysis of an Optoelectronic Modulator Integrated in a SOI Rib Waveguide Operating in the Gb/s Regime

2006 ◽  
Vol 934 ◽  
Author(s):  
Mario Iodice ◽  
Giuseppe Coppola ◽  
Rocco Cristian Zaccuri
Keyword(s):  
Switching Time ◽  
Modulation Depth ◽  
Free Carrier ◽  
Optical Modulation ◽  
Optical Modulator ◽  
Modulation Scheme ◽  
Optical Analysis ◽  
Electrical Analysis ◽  
Short Time ◽  
Optical Behavior

ABSTRACTSilicon is the most diffused material for microelectronic industry and, in recent times, it is becoming more and more widespread in integrated optic and optoelectronic fields. We present the thermo-electro-optical analysis of an integrated waveguide-vanishing-based optical modulator based on free-carrier dispersion effect, realizable on standard SOI wafer. The optical behavior is based on the vanishing of the lateral confinement in the rib region, and consequent cut-off of the propagating mode. Results show that an optical modulation depth close to 100% can be reached with a bandwidth of about 154 MHz. Smart electrical driving, that is an injection overdrive of a few volts for a very short time, allows to reach total ON-OFF switching time of about 860 ps. For that bias scheme the fall transient is then limiting the whole dynamic and the resulting bit rate in a pure digital modulation scheme is about 1.2 Gb/s

Enhanced Optical Modulation Depth of Terahertz Waves by Self-Assembled Monolayer of Plasmonic Gold Nanoparticles

2016 ◽  
Vol 4 (12) ◽  
pp. 1974-1980 ◽  
Author(s):  
Tianlong Wen ◽  
Dainan Zhang ◽  
Qiye Wen ◽  
Yulong Liao ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Modulation Depth ◽  
Optical Modulation ◽  
Terahertz Waves ◽  
Self Assembled Monolayer ◽  
Self Assembled

Sandwiched graphene/hBN/graphene photonic crystal fibers with high electro-optical modulation depth and speed

Nanoscale ◽  
2020 ◽  
Vol 12 (27) ◽  
pp. 14472-14478
Author(s):  
Xu Cheng ◽  
Xu Zhou ◽  
Langyi Tao ◽  
Wentao Yu ◽  
Can Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Wavelength Range ◽  
Modulation Depth ◽  
Photonic Crystal Fibers ◽  
Graphene Film ◽  
Optical Modulation ◽  
High Modulation ◽  
Crystal Fibers

We theoretically proposed a fiber modulator based on PCFs with a graphene/hBN/graphene film attached to its hole walls, which shows high modulation depth and speed with a broad wavelength range.

scholarly journals Deep Electrical Modulation of Terahertz Wave Based on Hybrid Metamaterial-Dielectric-Graphene Structure

2019 ◽  
Vol 9 (3) ◽  
pp. 507 ◽  
Author(s):  
Liangping Xia ◽  
Xin Zhang ◽  
Man Zhang ◽  
Suihu Dang ◽  
Shijian Huang ◽  
...  
Keyword(s):  
Modulation Depth ◽  
Active Material ◽  
Terahertz Wave ◽  
Experimental Result ◽  
Metallic Structure ◽  
Electrical Field ◽  
Electrical Modulation ◽  
Hybrid Metamaterial ◽  
Modulation Voltage ◽  
Applied Electrical Field

A terahertz modulation structure based on hybrid metamaterial and graphene is proposed and demonstrated in this work. The metamaterial with a square slit ring array excites terahertz resonance in the slits and enhances the interaction between the terahertz wave and graphene. The graphene layer acting as the active material is tuned by the applied electrical field. With the separation by a dielectric layer between the graphene and the metallic structure, the resonant frequency and transmitted energy are both modulated by the graphene. Experimental result indicates that the modulation depth of the terahertz transmitted amplitude is 65.1% when the applied modulation voltage is tuned 5 V.

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