Invisible Security Printing on Photoresist Polymer Readable by Terahertz Spectroscopy

Invisible Security Printing on Photoresist Polymer Readable by Terahertz Spectroscopy

We experimentally modulate the refractive index and the absorption coefficient of an SU-8 dry film in the terahertz region by UV light (362 nm) exposure with time dependency. Consequently, the refractive index of SU-8 film is increased by approximately 6% after UV light exposure. Moreover, the absor...

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Bibliographic Details
Main Authors: Hee Jun Shin, Min-Cheol Lim, Kisang Park, Sae-Hyung Kim, Sung-Wook Choi, Gyeongsik Ok
Format: Article
Language:English
Published: MDPI AG 2017-12-01
Series:Sensors
Subjects:
terahertz spectroscopy
anti-counterfeiting
security
photoresist material
Online Access:https://www.mdpi.com/1424-8220/17/12/2825

Internet

https://www.mdpi.com/1424-8220/17/12/2825

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