基于双层金属光栅的高消光比高透过率太赫兹偏振器
Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating
- 电子学报 2023年51卷第10期 页码：2733-2738
- 作者机构：
1.南开大学现代光学研究所,天津 300350
2.天津光电子传感器与传感网络技术重点实验室,天津 300350
3.天津微尺度光学信息技术科学重点实验室,天津 300350
- 作者简介：
[ "冀允允 女，2021年毕业于南开大学现代光学研究所.现任南开大学现代光学研究所讲师.主要研究方向为太赫兹液晶光子器件、新颖电磁超材料.中国电子学会会员编号：E190083706M.E-mail: jiyunyun@nankai.edu.cn" ]
[ "范飞 男，2014年获南开大学光学工程博士学位.现任南开大学现代光学研究所教授.天津市青年人才托举工程、天津市创新人才推进计划青年科技优秀人才.主要研究方向为太赫兹光谱与传感技术、太赫兹微纳结构光子功能器件.中国电子学会会员编号：E190026122M.E-mail: fanfei@nankai.edu.cn" ]
[ "程洁嵘 女，2016年获波士顿东北大学博士学位.现任南开大学现代光学研究所教授.国家优秀自费留学生奖学金获得者、天津市创新人才推进计划青年科技优秀人才.主要研究方向为太赫兹光场调控技术、AI光学设计.中国电子学会会员编号：E190025317M.E-mail: chengjr@nankai.edu.cn" ]
[ "王湘晖 女，2004年获南开大学光学工程博士学位.现任南开大学现代光学研究所教授.主要研究方向为非线性光学显微探测技术、太赫兹成像.E-mail: wangxianghui@nankai.edu.cn" ]
[ "常胜江（通讯作者） 男，1996年获南开大学光学工程博士学位.1998—2000年，应邀到香港城市大学电子工程系做博士后研究工作.现任南开大学现代光学研究所教授.主要研究方向为太赫兹科学技术、模式识别与图像处理." ]
- 基金信息：国家自然科学基金(61830112;61971242;62205160);中央高校基本科研业务费专项资金(63231159);国家重点研发计划(2017YFA0701000)
DOI：10.12263/DZXB.20230045
中图分类号： O436.3;TN91收稿：2023-01-13，
修回：2023-10-10，
纸质出版：2023-10-25
- 稿件说明：
移动端阅览
冀允允,范飞,程洁嵘等.基于双层金属光栅的高消光比高透过率太赫兹偏振器[J].电子学报,2023,51(10):2733-2738.
JI Yun-yun,FAN Fei,CHENG Jie-rong,et al.Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating[J].ACTA ELECTRONICA SINICA,2023,51(10):2733-2738.
冀允允,范飞,程洁嵘等.基于双层金属光栅的高消光比高透过率太赫兹偏振器[J].电子学报,2023,51(10):2733-2738. DOI： 10.12263/DZXB.20230045.
JI Yun-yun,FAN Fei,CHENG Jie-rong,et al.Terahertz Polarizer with High Extinction Ratio and High Transmittance Based on Bilayer Metal Grating[J].ACTA ELECTRONICA SINICA,2023,51(10):2733-2738. DOI： 10.12263/DZXB.20230045.
摘要
本文设计了一种基于双层金属亚波长光栅的太赫兹偏振器，其可以实现高透过率和良好消光比的特性.该偏振器是通过微加工技术在薄石英衬底的上下表面上制备而成的.实验和模拟结果均表明，双层金属光栅具有与单层金属光栅相近的透过率、更高的偏振度和更高的消光比.在0.3~2.0 THz的频率范围内，测量的透过率在83.4%到62.7%之间，偏振度大于99.7%，消光比大于29 dB.此外，设计的两种双层金属光栅偏振器件成功地应用于太赫兹时域光谱（TeraHertz Time Domain Spectroscopy，THz-TDS）系统中，获得了超过96.2%的偏振度和超过17.1 dB的消光比.通过调整金属亚波长光栅的参数（例如间距、线宽和金属膜厚度），可以进一步提高透过率、偏振度和消光比等特性.
Abstract
A terahertz polarizer based on bilayer metal subwavelength-grating is designed to achieve high transmission and good extinction ratio. The polarizer is fabricated on the upper and lower surfaces of thin quartz substrate by micro-fabrication technique. Both experimental and simulation results show that the bilayer metal grating has similar transmittance
higher degree of polarization and extinction ratio than the single-layer metal grating. Measured transmittance is between 83.4% and 62.7% in the frequency range of 0.3~2.0 THz
and the degree of polarization and extinction ratio is more than 99.7% and more than 29 dB
respectively. In addition
the two designed bilayer metal gratings are successfully used in the terahertz time-domain spectroscopy (THz-TDS) system
and the degree of polarization of more than 96.2% and the extinction ratio of more than 17.1 dB are obtained. The transmittance
degree of polarization and extinction ratio can be improved by further tuning the parameters (such as the pitch
line width
and metal film thickness) of the metal subwavelength-grating.
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references
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