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Published on: December 22, 2015
Broadband absorption spectroscopy via excitation of lossy resonance modes in thin films
D Razansky1, P D Einziger, D R Adam
1Department of Biomedical Engineering, Technion--Israel Institute of Technology, Haifa 32000, Israel. danir@tx.technion.ac.il
Abstract:
It is shown that broadband absorption spectroscopy utilizing thin lossy film configurations can be optimally facilitated when applied to metallic and insulating materials. For metallic films, the zero-order highly lossy resonance mode, characterized by ultra wideband absorption behavior under normal incidence, can be shifted, under parallel-polarization oblique incidence, toward a narrow band light-wavelength surface plasmon resonance condition. Higher order low-loss modes, however, occur in thin insulating films, exhibiting Debye relaxation behavior, typical for many aqueous solutions and biological substances. They can be excited in a highly scalable and sensitive manner in various frequency bands, between light and radio frequencies.
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