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Title: Enhanced photoacoustic detection using photonic crystal substrate

This paper demonstrates the enhanced photoacoustic sensing of surface-bound light absorbing molecules and metal nanoparticles using a one-dimensional photonic crystal (PC) substrate. The PC structure functions as an optical resonator at the wavelength where the analyte absorption is strong. The optical resonance of the PC sensor provides an intensified evanescent field with respect to the excitation light source and results in enhanced optical absorption by surface-immobilized samples. For the analysis of a light absorbing dye deposited on the PC surface, the intensity of photoacoustic signal was enhanced by more than 10-fold in comparison to an un-patterned acrylic substrate. The technique was also applied to detect gold nanorods and exhibited more than 40 times stronger photoacoustic signals. The demonstrated approach represents a potential path towards single molecule absorption spectroscopy with greater performance and inexpensive instrumentation.
Authors:
;  [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [3]
  1. Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States)
  2. Ames Laboratory-USDOE, Ames, Iowa 50011 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22262550
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ABSORPTION SPECTROSCOPY; CRYSTALS; NANOSTRUCTURES; PHOTOACOUSTIC EFFECT; RESONATORS; STRUCTURE FUNCTIONS; SUBSTRATES; URANIUM NITRIDES