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Polarization-independent optical spatial differentiation with a doubly-resonant one-dimensional guided-mode grating
Optics Express
|February 25, 2022
Summary
We developed a silicon nitride subwavelength grating that shows polarization-independent resonance for light at oblique angles. This grating performs spatial differentiation on the transmitted beam, useful for optical processing and sensing.
Area of Science:
- Photonics and optical engineering
- Materials science
- Nanotechnology
Background:
- Subwavelength gratings are crucial optical components.
- Guided-mode resonance (GMR) offers unique light manipulation properties.
- Polarization dependence can limit GMR device applications.
Purpose of the Study:
- To design and characterize a novel suspended silicon nitride subwavelength grating.
- To investigate its guided-mode resonance behavior at oblique incidence.
- To explore its potential for polarization-independent optical signal processing.
Main Methods:
- Fabrication of a suspended silicon nitride subwavelength grating.
- Experimental characterization of optical transmission spectra and beam profiles.
- Full numerical simulations to corroborate experimental findings.
Main Results:
- Observed a polarization-independent guided-mode resonance at oblique incidence.
- Demonstrated that the transmitted beam's transverse intensity profile acts as a first-order spatial differentiator.
- Confirmed experimental results through rigorous numerical simulations.
Conclusions:
- The designed silicon nitride grating exhibits polarization-independent GMR.
- The device performs spatial differentiation, valuable for optical signal processing.
- Its simple design and material properties make it suitable for optical processing, sensing, and optomechanics.
