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Paper Abstract and Keywords
Presentation 2021-01-22 15:35
Efficient analysis of a TM-pass terahertz waveguide polarizer using implicit and semi-implicit FDTD methods
Shoko Gomi, Jun Shibayama, Junji Yamauchi, Hisamatsu Nakano (Hosei Univ.) EST2020-77
Abstract (in Japanese) (See Japanese page) 
(in English) A TM-pass terahertz waveguide polarizer is efficiently analyzed using implicit and semi-implicit finite- difference time-domain (FDTD) methods.
First, we analyze the waveguide polarizer using the FDTD method based on the implicit locally one-dimensional (LOD) scheme.
We compare the computation time and accuracy with those of the explicit FDTD method.
It is found that the computation time is reduced to $simeq$10% of the explicit FDTD method with a maximum error of 10% for the guided-mode power, when the time step size is chosen to be 55 times as large as the explicit counterpart.
Furthermore, the waveguide polarizer is analyzed using the semi-implicit FDTD method.
In this study, we introduce the implicit scheme only to the discretization of the thickness direction of the polarizer, which requires a small spatial mesh.
It is shown that using a spatial mesh size with an aspect ratio of 1:16, the calculation time is reduced to 36% of the explicit FDTD method with a maximum error of 0.81%.
Keyword (in Japanese) (See Japanese page) 
(in English) Finite-difference time-domain (FDTD) method / Locally one-dimensional (LOD) / Semi-implicit FDTD method / Waveguide polarizer / Terahertz (THz) wave / Indium antimonide (InAs) / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 328, EST2020-77, pp. 124-128, Jan. 2021.
Paper # EST2020-77 
Date of Issue 2021-01-14 (EST) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF EST2020-77

Conference Information
Committee EST  
Conference Date 2021-01-21 - 2021-01-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EST 
Conference Code 2021-01-EST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Efficient analysis of a TM-pass terahertz waveguide polarizer using implicit and semi-implicit FDTD methods 
Sub Title (in English)  
Keyword(1) Finite-difference time-domain (FDTD) method  
Keyword(2) Locally one-dimensional (LOD)  
Keyword(3) Semi-implicit FDTD method  
Keyword(4) Waveguide polarizer  
Keyword(5) Terahertz (THz) wave  
Keyword(6) Indium antimonide (InAs)  
1st Author's Name Shoko Gomi  
1st Author's Affiliation Hosei University (Hosei Univ.)
2nd Author's Name Jun Shibayama  
2nd Author's Affiliation Hosei University (Hosei Univ.)
3rd Author's Name Junji Yamauchi  
3rd Author's Affiliation Hosei University (Hosei Univ.)
4th Author's Name Hisamatsu Nakano  
4th Author's Affiliation Hosei University (Hosei Univ.)
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Date Time 2021-01-22 15:35:00 
Presentation Time 25 
Registration for EST 
Paper # IEICE-EST2020-77 
Volume (vol) IEICE-120 
Number (no) no.328 
Page pp.124-128 
#Pages IEICE-5 
Date of Issue IEICE-EST-2021-01-14 

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