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Nonlinear super-resolution imaging via orientationally enhanced photorefractive effect in polymer

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Abstract

Resulting from the attenuation of evanescent waves in imaging, conventional microscopy techniques always yield few subwavelength features. In this Letter, a nonlinear far-field super-resolution technique is investigated, which is theoretically beyond the linear diffraction limitation. Based on the orientationally enhanced photorefractive effect of polymer, an inherently phase-matched diffraction grating is established and generates daughter modes by wave mixture. Almost all of these modes can pass through a finite-aperture filter and be sensed for reconstruction. An improvement of resolution of about four times is obtained and expected to be increased further. This work may provide a potential strategy for various subwavelength-resolved imaging applications.

© 2021 Optical Society of America

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Data underlying the results in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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