Investigating the response of As2S3-based SERS substrates

An investigation of the various parameters controlling the response of rapidly-fabricated As2S3 SERS substrates has been undertaken. As2S3 is an infrared-transmitting chalcogenide glass which is also photosensitive; it can be used to fabricate micro- and nano-structures as well as guide light. The substrates were optimised for interference angle, As2S3 thickness and metal type and thickness. Maximum enhancement factors are greater than 2.4×1032.4×103 at a wavelength of 1064 nm.