Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band
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 an...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/acca69 |
| _version_ | 1797746504142684160 |
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| author | Sudarshan Kalel Wei-Chih Wang |
| author_facet | Sudarshan Kalel Wei-Chih Wang |
| author_sort | Sudarshan Kalel |
| collection | DOAJ |
| description | 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 μ m, 60 μ m, 80 μ m) 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. |
| first_indexed | 2024-03-12T15:37:46Z |
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| id | doaj.art-e2bbaedf293942b181924c0e6f1d2fe7 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:37:46Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | Materials Research Express |
| spelling | doaj.art-e2bbaedf293942b181924c0e6f1d2fe72023-08-09T16:08:55ZengIOP PublishingMaterials Research Express2053-15912023-01-0110404530410.1088/2053-1591/acca69Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz bandSudarshan Kalel0Wei-Chih Wang1https://orcid.org/0000-0003-3571-4743Institute of Nanoengineering and Microsystems, National Tsinghua University , 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan, 30013, Republic of ChinaInstitute 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 AmericaPolymers 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 μ m, 60 μ m, 80 μ m) 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.https://doi.org/10.1088/2053-1591/acca69terahertzextinction coefficientPVDF-TrFEPVDF-TrFE-CTFEoptical constantsrefractive index |
| spellingShingle | Sudarshan Kalel Wei-Chih Wang Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band Materials Research Express terahertz extinction coefficient PVDF-TrFE PVDF-TrFE-CTFE optical constants refractive index |
| title | Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band |
| title_full | Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band |
| title_fullStr | Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band |
| title_full_unstemmed | Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band |
| title_short | Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band |
| title_sort | optical properties of pvdf trfe and pvdf trfe ctfe films in terahertz band |
| topic | terahertz extinction coefficient PVDF-TrFE PVDF-TrFE-CTFE optical constants refractive index |
| url | https://doi.org/10.1088/2053-1591/acca69 |
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