Abstract

Polymers have enormous potential in the optoelectronic and biomedical fields due to flexibility, biocompatibility, and ease of fabrication. Recent developments in the use of terahertz (THz) waves for biomedical and security applications demand information on the optical properties of the polymers and polymer composites in this region. In the present work, transmission, refractive index (n), and extinction coefficient (k) of PVDF-TrFE (75/25 mol.) copolymer and PVDF-TrFE-CTFE (73/23/4 mol.) terpolymer films with different thicknesses (40 μm, 60 μm, 80 μm) are measured by the THz-TDS system (up to 1 THz). PVDF copolymer and terpolymer films show average transmission of more than 90% irrespective of thickness. The average refractive index of PVDF-TrFE (75/25 mol.) copolymer and PVDF-TrFE-CTFE (73/23/4 mol.) terpolymer films are 1.50 ± 0.04 and 1.45 ± 0.05 respectively. The estimated extinction coefficient is considerably low for both polymer films for frequencies less than 0.6 THz. The average indices for PVDF-TrFE and PVDF-TrFE-CTFE films are close, however, the loss in PVDF-TrFE films is larger than the PVDF-TrFE-CTFE films. High transmission, low loss and ferroelectric properties make these PVDF based polymers highly desirable in light-wave manipulation, flexible electronic and solar devices.

Details

Title
Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band
Author
Kalel, Sudarshan 1 ; Wang, Wei-Chih 2   VIAFID ORCID Logo 

1  Institute of Nanoengineering and Microsystems, National Tsinghua University , 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan, 30013, Republic of China 
2  Institute of Nanoengineering and Microsystems, National Tsinghua University , 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan, 30013, Republic of China; Power Mechanical Engineering, National Tsinghua University , 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan, 30013, Republic of China; Department of Mechanical Engineering, University of Washington , Seattle, WA 98195, United States of America; Department of Electrical & Computer Engineering, University of Washington , Seattle, WA 98195, United States of America 
First page
045304
Publication year
2023
Publication date
Apr 2023
Publisher
IOP Publishing
e-ISSN
20531591
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1088/2053-1591/acca69
ProQuest document ID
2801291923
Copyright
© 2023 The Author(s). Published by IOP Publishing Ltd. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.