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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

First-order optical spatial differentiator based on a guided-mode resonant grating.

Dmitry A Bykov, Leonid L Doskolovich, Andrey A Morozov

|May 3, 2018

Summary

This summary is machine-generated.

This study demonstrates a subwavelength diffraction grating that performs optical beam differentiation. Experimental results confirm its potential for advanced photonic devices.

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Area of Science:

Photonics
Optical Engineering
Nanophotonics

Background:

Subwavelength diffraction gratings are key components in nanophotonics.
Optical beam shaping and information processing require precise control over light propagation.

Purpose of the Study:

To experimentally demonstrate a subwavelength diffraction grating performing first-order differentiation of optical beam profiles.
To validate the grating's performance using an analytical model and experimental measurements.

Main Methods:

Experimental demonstration using a subwavelength diffraction grating.
Oblique incidence transmission measurements.
Analytical modeling of guided-mode resonance.
Transfer function estimation from incident and transmitted beam profiles.

Main Results:

The grating successfully performed first-order differentiation of the optical beam's transverse profile.
Experimental results closely matched the analytical model predictions.
Guided-mode resonance at oblique incidence was identified as the mechanism for differentiation.
The grating's transfer function approximated that of an exact differentiator near resonance.

Conclusions:

Subwavelength diffraction gratings can act as optical differentiators.
The demonstrated structure shows promise for applications in beam shaping, optical information processing, and analog optical computing.