Abstract
In this Letter, we report the confinement of a uniform beam of light () at the nodes of a standing wave () via absorbance modulation. In the present implementation of absorbance modulation, a thin polymer film containing a photochromic azobenzene side chain is exposed to a standing wave at and a uniform beam at , resulting in alternate regions of high and low absorbance. Light at is localized around the low-absorbance regions. Using photoresist exposures, we mapped out the localized light intensity distribution, which agrees well with our theoretical model. Since the width of this distribution is primarily determined by the ratio of the intensities at the two wavelengths, this technique opens up the possibility of localizing light fields below the diffraction limit using far-field optics.
- Received 20 September 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.043905
©2007 American Physical Society