基于宇称-时间对称结构的磁光调制器  

Mag-Optical Modulator Based on Parity-Time Symmetric Structure

作　　者：易凌俊 李长红[1] Yi Lingjun;Li Changhong(School of Electronic Information,Qingdao University,Qingdao,Shandong 266071,China)

机构地区：[1]青岛大学电子信息学院,山东青岛266071

出　　处：《光学学报》2022年第2期202-211,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61307050,61701271);山东省自然科学基金(ZR2016AM27)。

摘　　要：提出一种基于周期性宇称-时间(PT)对称结构的磁光调制器,该结构由在中间的水基MnFe;O;磁流体层和两侧周期性PT对称单元构成,利用磁流体的磁光效应,实现具有增益的高消光比光调制。利用传输矩阵法对结构进行仿真分析,结果表明,对于波长处于结构禁带低透射区域的入射光波,在以1550 nm为中心从1513 nm到1587 nm的波长范围内,调制器对入射光最大增益接近25 dB,消光比最高接近60 dB,最低可达30 dB,同时入射光波透射率和波长移动的平均调制灵敏度最大分别可以达到74.51 dB和108.2 nm。A mag-optical modulator based on periodic parity-time(PT) symmetry structure is proposed, which consists of hydro-based MnFe;O;magnetofluid layer in the middle and periodic PT symmetry units on both sides. The high extinction ratio modulation with gain is realized by using the magneto-optic effect of the magnetic fluid. The transfer matrix method is used to simulate and analyze the structure, it turns out that, for the incident light wave whose wavelength is in the low transmission region of the structure gap band(in the wavelength range from 1513 nm to 1587 nm with 1550 nm as the center), the maximum gain of the modulator for incident light is close to 25 dB, the maximum and the minimum extinction ratio are close to 60 dB and 30 dB, respectively. Simultaneously, the average modulation sensitivity of incident light wave transmission and wavelength shift can reach the maximum of 74.51 dB and 108.2 nm, respectively.

关 键 词：光学器件 宇称-时间对称 磁光效应 调制器 传输矩阵法 

分 类 号：O436.4[机械工程—光学工程] TN761[理学—光学]