Title :
Polymerisation-related changes in THz transmission in SU8 and polystyrene
Author :
Naftaly, M. ; Dimitrakopoulos, D. ; Miles, R.E. ; Brown, S. ; Perrier, S.
Author_Institution :
Univ. of Leeds, Leeds
Abstract :
THz TDS was used to study the effects of polymerisation on THz transmission in SU8 and polystyrene. SU8 samples, spun onto a THz-transparent polyethelene substrate, were cross-linked to varying degrees using different UV exposure times. Variations in THz absorption and refractive index were observed as a function of the exposure times. Polystyrene samples were prepared as monodispersed powders with varying molecular weights. Variations of the THz refractive index with molecular weight were observed and analysed using the Claussius-Mosotti equation for the dielectric constant.
Keywords :
absorption coefficients; permittivity; polymerisation; polymers; powders; refractive index; submillimetre wave spectra; ultraviolet radiation effects; Claussius-Mosotti equation; SU8 samples; TDS; THz absorption; THz transmission; UV exposure times; curing; dielectric constant; epoxy resin; monodispersed powder preparation; negative photoresist; polymerisation-related changes; polystyrene; refractive index; time domain spectroscopy; transparent polyethelene substrate; Curing; Electromagnetic wave absorption; Equations; Frequency; Optical refraction; Optical scattering; Polymer films; Powders; Refractive index; Spectroscopy;
Conference_Titel :
Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006. IRMMW-THz 2006. Joint 31st International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0400-2
Electronic_ISBN :
1-4244-0400-2
DOI :
10.1109/ICIMW.2006.368265
