Continuous wave terahertz common path phase shifting interference using a liquid crystal phase shifter

被引:6
作者
Ito, Ryota [1 ]
Honma, Michinori [1 ]
Nose, Toshiaki [1 ]
机构
[1] Akita Prefectural Univ, Dept Intelligent Mechatron, 84-4 Ebinokuchi, Akita 0150055, Japan
基金
日本科学技术振兴机构;
关键词
Terahertz; Liquid crystal; Phase shifting interference; TIME-DOMAIN SPECTROSCOPY; INTERFEROMETER; BIREFRINGENCE; SYSTEM;
D O I
10.35848/1347-4065/ac0d89
中图分类号
O59 [应用物理学];
学科分类号
摘要
A continuous wave terahertz common path phase shifting interference (PSI) method using a liquid crystal (LC) phase shifter was developed in this work. Using an LC phase shifter is a good candidate for common path PSI, however, it is difficult to achieve pure phase measurement in the terahertz region owing to the strong dichroism of LC materials. In this study, hydrogen-bonded LC, which exhibits no dichroism at 2.5 THz, was introduced to an LC phase shifter and the common path PSI was demonstrated using an optically pumped gas laser at 2.5 THz. Our experimental and calculation results indicate that the phase difference between the ordinary and extraordinary rays of x-cut quartz substrates was successfully obtained by using the four-step phase shifting algorithm. Furthermore, the bias noise such as the influence of reflection at the sample surface was eliminated during data processing based on the four-step phase shifting algorithm.
引用
收藏
页数:7
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共 36 条
  • [1] Terahertz interferometric and synthetic aperture imaging
    Bandyopadhyay, A
    Stepanov, A
    Schulkin, B
    Federici, MD
    Sengupta, A
    Gary, D
    Federici, JE
    Barat, R
    Michalopoulou, ZH
    Zimdars, D
    [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 2006, 23 (05) : 1168 - 1178
  • [2] DIGITAL WAVEFRONT MEASURING INTERFEROMETER FOR TESTING OPTICAL SURFACES AND LENSES
    BRUNING, JH
    HERRIOTT, DR
    GALLAGHER, JE
    ROSENFELD, DP
    WHITE, AD
    BRANGACCIO, DJ
    [J]. APPLIED OPTICS, 1974, 13 (11) : 2693 - 2703
  • [3] Circular-polarization-splitting common-path interferometer based on a zero-twist liquid-crystal display
    Davis, Jeffrey A.
    Pascoguin, B. Melvin L.
    Moreno, Ignacio
    Nava-Vega, A.
    [J]. OPTICS LETTERS, 2009, 34 (09) : 1486 - 1488
  • [4] Electrically tunable liquid crystal terahertz phase shifter driven by transparent polymer electrodes
    Du, Yan
    Tian, Hao
    Cui, Xuan
    Wang, Hao
    Zhou, Zhong-Xiang
    [J]. JOURNAL OF MATERIALS CHEMISTRY C, 2016, 4 (19) : 4138 - 4142
  • [5] Improved response time of thick liquid crystal device by using electrospun nanofiber
    Duong, Toan Quoc
    Kobayashi, Hiroaki
    Inoue, Yo
    Moritake, Hiroshi
    [J]. JAPANESE JOURNAL OF APPLIED PHYSICS, 2017, 56 (06)
  • [6] FAR-INFRARED TIME-DOMAIN SPECTROSCOPY WITH TERAHERTZ BEAMS OF DIELECTRICS AND SEMICONDUCTORS
    GRISCHKOWSKY, D
    KEIDING, S
    VANEXTER, M
    FATTINGER, C
    [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1990, 7 (10) : 2006 - 2015
  • [7] Terahertz profilometry at 600 GHz with 0.5 μm depth resolution
    Hils, Bernd
    Thomson, Mark D.
    Loeffler, Torsten
    von Spiegel, Wolff
    am Weg, Christian
    Roskos, Hartmut G.
    de Maagt, Peter
    Doyle, Dominic
    Geckeler, Ralf D.
    [J]. OPTICS EXPRESS, 2008, 16 (15) : 11289 - 11293
  • [8] IMAGING WITH TERAHERTZ WAVES
    HU, BB
    NUSS, MC
    [J]. OPTICS LETTERS, 1995, 20 (16) : 1716 - &
  • [9] Electrically Tunable Hydrogen-Bonded Liquid Crystal Phase Control Device
    Ito, Ryota
    Honma, Michinori
    Nose, Toshiaki
    [J]. APPLIED SCIENCES-BASEL, 2018, 8 (12):
  • [10] Large birefringence smectic-A liquid crystals for high contrast bistable displays
    Ji, Wei
    Shi, Liang-Yu
    Tang, Hong
    Sun, Gang
    Hu, Wei
    Liang, Xiao
    [J]. OPTICAL MATERIALS EXPRESS, 2015, 5 (02): : 281 - 286