Surface-enhanced Raman scattering on optical material fabricated by femtosecond laser

Wenhui Wang; Haibin Huo; Nan Wu; Mengyan Shen; Charles Guthy; Xingwei Wang

doi:10.1117/12.852617

26 April 2010 Surface-enhanced Raman scattering on optical material fabricated by femtosecond laser

Wenhui Wang, Haibin Huo, Nan Wu, Mengyan Shen, Charles Guthy, Xingwei Wang

Proceedings Volume 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII; 76730K (2010) https://doi.org/10.1117/12.852617
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Raman spectroscopy is a technology that can detect and distinguish materials based on the materials' Raman scattering. However, the signal produced using this technology is usually too small to be useful. The Raman spectrum signal can be enhanced by creating rough patches on the surface of the material. In this paper, a novel method to produce nanometer-sized features on optical materials such as glass, fused silica, and quartz substrate is presented. Using a femtosecond laser, the transparent materials are sputtered and deposited. When the materials cool down, they produce structures with nano-features. These nano-features on optical materials can make designing optical sensing systems much easier. Scanning electron microscope photos of nano-structures on quartz substrate and optical fiber show that features less than 100 nm in size have been successfully fabricated. The 3D micro- and nano-structures of the sensor were studied using a confocal Raman spectrum microscope and focused ion-beam milling. Raman spectrum signals show that the strength of the signal generated by Raman scattering was greatly enhanced compared to substrates without nano-features.

Citation Download Citation

Wenhui Wang, Haibin Huo, Nan Wu, Mengyan Shen, Charles Guthy, and Xingwei Wang "Surface-enhanced Raman scattering on optical material fabricated by femtosecond laser", Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 76730K (26 April 2010); https://doi.org/10.1117/12.852617

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