Journal
OPTICS EXPRESS
Volume 20, Issue 28, Pages 29694-29704Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.029694
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Funding
- Integrated Nanoscience Platform for Ireland (INSPIRE)
- Higher Education Authority in Ireland
- CERUNA-FUNDP foundation
- European Community's Seventh Framework Programme [280804]
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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
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