scholarly journals Дефектная мода в СВЧ волноводных брэгговских структурах с металлическими штырями

2019 ◽  
Vol 89 (10) ◽  
pp. 1606
Author(s):  
Д.А. Усанов ◽  
А.В. Скрипаль ◽  
В.Н. Посадский ◽  
В.С. Тяжлов ◽  
А.В. Байкин
Keyword(s):  
Photonic Crystal ◽  
Frequency Response ◽  
Band Gap ◽  
Dynamic Range ◽  
Defect Mode ◽  
Response Functions ◽  
Bragg Structure ◽  
Microwave Photonic ◽  
Gap Characteristics ◽  
Wide Wall

AbstractA waveguide Bragg structure containing equidistant cylindrical pins that are galvanically coupled to a wide wall of the waveguide is used to implement frequency response functions characterized by the presence of a band gap. Characteristics of a defect mode of the microwave photonic crystal with a pin element as a defect with an n – i – p – i – n structure with controlled conductivity placed in the capacitive gap are experimentally studied and calculated. Controlled reflectance of a microwave signal with a dynamic range of greater than 50 dB is obtained at the frequency of the defect mode.

Tunable plasmonic band gap and defect mode in one-dimensional photonic crystal covered with graphene

2014 ◽  
Vol 16 (12) ◽  
pp. 125005 ◽  
Author(s):  
Hong-Ming Fan ◽  
Tong-Biao Wang ◽  
Nian-Hua Liu ◽  
Jiang-Tao Liu ◽  
Qing-Hua Liao ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Defect Mode ◽  
One Dimensional ◽  
Dimensional Photonic Crystal

Band gap characteristics of 1D static and moving photonic crystal

2020 ◽  
Vol 597 ◽  
pp. 412360 ◽  
Author(s):  
Laxmi Shiveshwari ◽  
S.K. Awasthi
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Gap Characteristics

Study on control of defect mode in hybrid mirror chirped porous silicon photonic crystal

2018 ◽  
Vol 32 (09) ◽  
pp. 1850011
Author(s):  
Ying Chen ◽  
Pei Luo ◽  
Yangyang Han ◽  
Xingning Cui ◽  
Lei He
Keyword(s):  
Photonic Crystal ◽  
Porous Silicon ◽  
Band Gap ◽  
Defect Mode ◽  
Relative Location ◽  
Q Value ◽  
Optical Resonance ◽  
Defect Modes ◽  
High Q ◽  
Silicon Photonic

Based on the optical resonance principle and the tight-binding theory, a hybrid mirror chirped porous silicon photonic crystal is proposed. The control of the defect mode in hybrid mirror chirped porous silicon photonic crystal is studied. Through the numerical simulation, the control regulations of the defect modes resulted by the number of the periodical layers for the fundamental unit and the cascading number of the chirped structures are analyzed, and the split and the degeneration of the defect modes resulted by the change of the relative location between the mirror structures and the quasi-mirror structures are discussed. The simulation results show that the band gap would be broadened with the increase of the chirp quantity and the layer number of unilateral chirp. Adjusting the structural parameters of the hybrid mirror structure, the multimode characteristics will occur in the band gap. The more the cascading number of the chirped units, the more the number of the filtering channels will be. In addition, with the increase of the relative location between the mirror structures and the quasi-mirror structures, the degeneration of the defect modes will occur and can obtain high Q value. The structure can provide effective theoretical references for the design the multi-channel filters and high Q value sensors.

Effects of Filling Ratio and Lattice Points Direction on Two-Dimensional Triangular-Lattice Photonic Crystal Band Gap Characteristics

2013 ◽  
Vol 33 (1) ◽  
pp. 0116003
Author(s):  
韩利红 Han Lihong ◽  
刘立明 Liu Liming ◽  
俞重远 Yu Zhongyuan ◽  
郭璇 Guo Xuan ◽  
袁桂芳 Yuan Guifang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Triangular Lattice ◽  
Filling Ratio ◽  
Lattice Points ◽  
Two Dimensional ◽  
Gap Characteristics

scholarly journals Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response

2018 ◽  
Vol 8 (12) ◽  
pp. 2433 ◽  
Author(s):  
Weicheng Xia ◽  
Ruiqi Zheng ◽  
Bijuan Chen ◽  
Erwin Chan ◽  
Xudong Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
Phase Shifter ◽  
Dynamic Range ◽  
Optical Filter ◽  
Signal Amplitude ◽  
Wide Frequency Range ◽  
Amplitude Variation ◽  
Microwave Photonic ◽  
Phase Deviation ◽  
Hybrid Coupler

This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented.

Fabrication of Diamond-Structure Alumina Photonic Crystal with Rectangle Cavity Defect and its Microwave Properties

2013 ◽  
Vol 423-426 ◽  
pp. 34-37
Author(s):  
Shi Bin Chen ◽  
Yun Shi Yao ◽  
Rui Long Wang
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Theoretical Calculations ◽  
Transmission Spectra ◽  
Diamond Structure ◽  
Microwave Photonic ◽  
Gel Casting ◽  
Novel Approach ◽  
Photonic Band

A diamond-structure alumina photonic crystal with a rectangle cavity defect has been fabricated combining stereolithography (SL) and gel-casting. In transmission spectra a resonance peak of transmission of 70% is observed in the band gap of 10.48Ghz-12.21Ghz, by comparing with the measured result of the perfect structure and theoretical calculations. Experimental results showed that the peak of photonic band gap was caused by the rectangle cavity defect of the diamond structural photonic crystal. The method provides us with a novel approach to fabricate ceramic microwave photonic crystals with point defect.

Influence of defect mode displacement in photonic crystal band gap over light group velocity

Optik ◽  
2011 ◽  
Vol 122 (8) ◽  
pp. 703-706 ◽  
Author(s):  
Na Zhu ◽  
Ning Zhang ◽  
Wu Liu ◽  
Li Zhang ◽  
Chuancheng Dong
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Group Velocity ◽  
Defect Mode ◽  
Light Group
Sign in / Sign up

Export Citation Format

Share Document