Direct and quantitative photothermal absorption spectroscopy of individual particulates
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019_2013_Tong.pdf
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Author(s)
Zheng, Ruiting
Shen, Sheng
Tong, Jonathan K.
Hsu, Wei-Chun
Han, Sang Eon
Burg, Brian R.
Chen, Gang
Date Issued
December 2013
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Tong, Jonathan K. et al. “Direct and Quantitative Photothermal Absorption Spectroscopy of Individual Particulates.” Applied Physics Letters 103, 26 (December 2013): 261104 © 2013 AIP Publishing LLC
Version
Final published version
Abstract
Photonic structures can exhibit significant absorption enhancement when an object's length scale is comparable to or smaller than the wavelength of light. This property has enabled photonic structures to be an integral component in many applications such as solar cells, light emitting diodes, and photothermal therapy. To characterize this enhancement at the single particulate level, conventional methods have consisted of indirect or qualitative approaches which are often limited to certain sample types. To overcome these limitations, we used a bilayer cantilever to directly and quantitatively measure the spectral absorption efficiency of a single silicon microwire in the visible wavelength range. We demonstrate an absorption enhancement on a per unit volume basis compared to a thin film, which shows good agreement with Mie theory calculations. This approach offers a quantitative approach for broadband absorption measurements on a wide range of photonic structures of different geometric and material compositions.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/1.4858387
