Super-resolution imaging via spatiotemporal frequency shifting and coherent detection

Details Super-resolution imaging via spatiotemporal frequency shifting and coherent detection Super-resolution imaging via spatiotemporal frequency shifting and coherent detection

2012-01-21

arxiv.org/abs/1201.4517v1

Opt. Express 19, 22350-22357 (2011)

Physics

Optics

arXiv admin note: substantial text overlap with arXiv:1003.2642

Scientific paper

10.1364/OE.19.022350

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.

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