Effect of film thickness on localized surface plasmon enhanced chemical sensor

Aschalew Kassu; Carlton Farley III; Anup Sharma; Wonkyu Kim; Junpeng Guo

doi:10.1117/12.2050178

22 May 2014 Effect of film thickness on localized surface plasmon enhanced chemical sensor

Aschalew Kassu, Carlton Farley III, Anup Sharma, Wonkyu Kim, Junpeng Guo

Proceedings Volume 9106, Advanced Environmental, Chemical, and Biological Sensing Technologies XI; 910605 (2014) https://doi.org/10.1117/12.2050178
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

A highly-sensitive, reliable, simple and inexpensive chemical detection and identification platform is demonstrated. The sensing technique is based on localized surface plasmon enhanced Raman scattering measurements from gold-coated highly-ordered symmetric nanoporous ceramic membranes fabricated from anodic aluminum oxide. To investigate the effects of the thickness of the sputter-coated gold films on the sensitivity of sensor, and optimize the performance of the substrates, the geometry of the nanopores and the film thicknesses are varied in the range of 30 nm to 120 nm. To characterize the sensing technique and the detection limits, surface enhanced Raman scatterings of low concentrations of a standard chemical adsorbed on the gold coated substrates are collected and analyzed. The morphology of the proposed substrates is characterized by atomic force microscopy and the optical properties including transmittance, reflectance and absorbance of each substrate are also investigated.

Citation Download Citation

Aschalew Kassu, Carlton Farley III, Anup Sharma, Wonkyu Kim, and Junpeng Guo "Effect of film thickness on localized surface plasmon enhanced chemical sensor", Proc. SPIE 9106, Advanced Environmental, Chemical, and Biological Sensing Technologies XI, 910605 (22 May 2014); https://doi.org/10.1117/12.2050178

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