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A framework for far-field infrared absorption microscopy beyond the diffraction limit
Date
2012
Abstract
A framework is proposed for infrared (IR) absorption microscopy in the far-field with a spatial resolution below the diffraction limit. The sub-diffraction resolution is achieved by pumping a transient contrast in the population of a selected vibrational mode with IR pulses that exhibit alternating central minima and maxima, and by probing the corresponding absorbance at the same wavelength with adequately delayed Gaussian pulses. Simulations have been carried out on the basis of empirical parameters emulating patterned thin films of octadecyltrichlorosilane and a resolution of 250 nm was found when probing the CH2 stretches at 3.5 mu m with pump energies less than ten times the vibrational saturation threshold. (C) 2012 Optical Society of America
Supervisor
Description
peer-reviewed
Publisher
Optical Society of America
Citation
Optics Express;20(28), pp. 29694-29704
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Funding code
Funding Information
Higher Education Authority (HEA), CERUNA-FUNDP, European Research Council (ERC)
Sustainable Development Goals
External Link
Type
Article
Rights
https://creativecommons.org/licenses/by-nc-sa/1.0/