Super-resolution imaging via spatiotemporal frequency shifting and coherent detection
Abstract
Diffraction limit is manifested in the loss of high spatial frequency information that results from decay of evanescent waves. As a result, conventional far-field optics yields no information about an object's subwavelength features. Here we propose a novel approach to recovering evanescent waves in the far field, thereby enabling subwavelength-resolved imaging and spatial spectroscopy. Our approach relies on shifting the frequency and the wave vector of near-field components via scattering on acoustic phonons. This process effectively removes the spatial frequency cut-off for unambiguous far field detection. This technique can be adapted for digital holography, making it possible to perform phase-sensitive subwavelength imaging. We discuss the implementation of such a system in the mid-IR and THz bands, with possible extension to other spectral regions.
Cite
@article{arxiv.1201.4517,
title = {Super-resolution imaging via spatiotemporal frequency shifting and coherent detection},
author = {Leonid Alekseyev and Evgenii Narimanov and Jacob Khurgin},
journal= {arXiv preprint arXiv:1201.4517},
year = {2012}
}
Comments
arXiv admin note: substantial text overlap with arXiv:1003.2642