scholarly journals Reversible unidirectional reflection and absorption of PT-symmetry structure under electro-optical modulation

2018 ◽  
Vol 416 ◽  
pp. 25-31 ◽  
Author(s):  
Yun-tuan Fang ◽  
Yi-chi Zhang ◽  
Jing Xia
Keyword(s):  
Pt Symmetry ◽  
Optical Modulation ◽  
Symmetry Structure

scholarly journals Simulation Research on Blood Detection Sensing with Parity-Time Symmetry Structure

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1030
Author(s):  
Lingjun Yi ◽  
Changhong Li
Keyword(s):  
Defect Mode ◽  
Detection Performance ◽  
Unit Cell ◽  
Pt Symmetry ◽  
Simulation Research ◽  
Time Symmetry ◽  
Performance Indexes ◽  
Sensing Model ◽  
Concentration Changes ◽  
Symmetry Structure

To realize the design of a medical sensor with excellent comprehensive performance indexes, herein, a plasma concentration sensing model satisfying the Parity-Time (PT) symmetric condition is proposed. In this paper, the transfer matrix method was used to simulate the transmittance spectrum of the structure, according to the amplification effect on defect mode transmission and various detection performance indexes of the structure. We numerically optimized the parameters of the structure, such as the number of PT-symmetry unit cell N, the sample layer thickness dD as well as the macroscopic Lorentz oscillation intensity α in the PT-symmetry unit cell. The calculation results demonstrate that when the sample concentration changes from 0 g/L to 50 g/L, the wavelength of defect peak shifts from 1538 nm to 1561 nm, and the average quality factor, sensitivity, average figure of merit, average detection limit and average resolution of the structure can reach 78,564, 0.4409 nm/(g/L) (or 227.05 nm/RIU), 11,515 RIU−1, 5.1 × 10−6 RIU and 0.038 g/L, respectively. Not only the sensitivity and resolution of the PT-symmetry structure are better than that of the similar sensors, but it also has excellent comprehensive detection performance, which indicates that the developed sensor can be used in high-precision biomedical detection devices.

scholarly journals Simulation Study of In-Phase and Out-Phase Enhanced Absorption of Graphene Based on Parity–Time Symmetry One-Dimensional Photonic Crystal Structure

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1513
Author(s):  
Lingjun Yi ◽  
Changhong Li
Keyword(s):  
Photonic Crystal ◽  
Electric Field ◽  
Optical Communication ◽  
Communication Systems ◽  
Pt Symmetry ◽  
Square Wave ◽  
Enhanced Absorption ◽  
Time Symmetry ◽  
Optical Communication Systems ◽  
Symmetry Structure

In the field of modern optical communication systems and photoelectric detection, new components with complex functions and excellent performance are urgently needed. In this paper, a graphene-based parity–time (PT) symmetry structure is proposed, which is achieved by preparing the graphene layer on the top of a PT-symmetry photonic crystal. The transfer matrix method was used to calculate the absorptance of graphene, and a unique amplified absorption effect was found. Meanwhile, the peak value and wavelength position of the absorption can be modulated via the applied electric field. The results show that by adjusting the negative square-wave electric field from −3.5 × 10−5 to −13.5 × 10−5 V/nm (or the positive square-wave electric field from 2 × 10−5 to 11 × 10−5 V/nm), the proposed structure can achieve in-phase (or out-phase) enhanced absorption for the communication wavelength 1550 nm, with the absorption of graphene from 17 to 28 dB (or 30 to 15 dB) corresponding to the square-wave modulation electric field change. The modulable absorption properties of graphene in the structure have potential in optoelectronic devices and optical communication systems.

Electro-optical modulation properties of GaAs doping superlattices

1989 ◽  
Vol 136 (1) ◽  
pp. 38
Author(s):  
A.P. Thorn ◽  
P.C. Klipstein ◽  
R.W. Glew
Keyword(s):  
Optical Modulation

PT-symmetry in optics

2014 ◽  
Vol 184 (11) ◽  
pp. 1177-1198 ◽  
Author(s):  
A.A. Zyablovsky ◽  
Aleksei P. Vinogradov ◽  
Aleksandr A. Pukhov ◽  
A.V. Dorofeenko ◽  
A.A. Lisyansky
Keyword(s):  
Pt Symmetry
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