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Volume 7
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10.3390/photonics7040108
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Article

A Computational Study on Performance Improvement of THz Signal from a Grating Photoconductive Antenna

by
Jia Yi Chia
*,
Khwanchai Tantiwanichapan
,
Rungroj Jintamethasawat
,
Asmar Sathukarn
,
Woraprach Kusolthossakul
and
Noppadon Nuntawong
National Electronics and Computer Technology Center (NECTEC), 112 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand
*
Author to whom correspondence should be addressed.
Photonics 2020, 7(4), 108; https://doi.org/10.3390/photonics7040108
Submission received: 1 October 2020 / Revised: 25 October 2020 / Accepted: 26 October 2020 / Published: 11 November 2020
(This article belongs to the Section Optoelectronics and Optical Materials)
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Abstract

A diffractive grating is a well-known optical component and is extensively used in many applications. This research work explores application of the diffractive grating in a photoconductive antenna (PCA) of a terahertz time domain spectroscopy (THz-TDS) system, by utilizing benefits of a sub-wavelength grating structure. The grating PCA structure was modeled and simulated by COMSOL Multiphysics software (COMSOL, Inc., Burlington, MA, USA). Performance of the proposed PCA design is studied in terms of its induced photocurrent. The effects of geometrical parameters of the grating are also investigated and analyzed through its optical and electrical responses. Thanks to the increase in absorption of the incident laser’s electric field, the simulation results show a 63% increment of the induced photocurrent in the grating PCA, compared with the conventional planar PCA.
Keywords: diffractive grating; anti-reflection; THz time domain spectroscopy; photoconductive antenna diffractive grating; anti-reflection; THz time domain spectroscopy; photoconductive antenna
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MDPI and ACS Style

Chia, J.Y.; Tantiwanichapan, K.; Jintamethasawat, R.; Sathukarn, A.; Kusolthossakul, W.; Nuntawong, N. A Computational Study on Performance Improvement of THz Signal from a Grating Photoconductive Antenna. Photonics 2020, 7, 108. https://doi.org/10.3390/photonics7040108

AMA Style

Chia JY, Tantiwanichapan K, Jintamethasawat R, Sathukarn A, Kusolthossakul W, Nuntawong N. A Computational Study on Performance Improvement of THz Signal from a Grating Photoconductive Antenna. Photonics. 2020; 7(4):108. https://doi.org/10.3390/photonics7040108

Chicago/Turabian Style

Chia, Jia Yi, Khwanchai Tantiwanichapan, Rungroj Jintamethasawat, Asmar Sathukarn, Woraprach Kusolthossakul, and Noppadon Nuntawong. 2020. "A Computational Study on Performance Improvement of THz Signal from a Grating Photoconductive Antenna" Photonics 7, no. 4: 108. https://doi.org/10.3390/photonics7040108

APA Style

Chia, J. Y., Tantiwanichapan, K., Jintamethasawat, R., Sathukarn, A., Kusolthossakul, W., & Nuntawong, N. (2020). A Computational Study on Performance Improvement of THz Signal from a Grating Photoconductive Antenna. Photonics, 7(4), 108. https://doi.org/10.3390/photonics7040108

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