# Hyperuniform disordered photonic crystal polarizers

## TL;DR

This paper introduces and experimentally demonstrates a hyperuniform disordered photonic crystal polarizer with ultra-broadband TM polarization filtering capabilities on a silicon platform, achieving high extinction ratios and low insertion loss.

## Contribution

It presents the design and realization of a hyperuniform disordered photonic crystal polarizer with an ultra-broadband spectral range and low loss, advancing silicon photonic polarization control.

## Key findings

- Achieved a 30-dB PER bandwidth of 265 nm experimentally.
- Demonstrated a 210 nm PER bandwidth with high PER of 39.6 dB.
- Low TM mode insertion loss of 1.1 dB in a compact device.

## Abstract

An ultra-broadband transverse magnetic (TM) pass hyperuniform disordered photonic crystal (HUDPC) polarizer is proposed and demonstrated on a silicon-on-insulator platform. Propagation of the transverse electric mode is blocked by three combined effects, including the photonic bandgap (PBG) effect, diffusive (non-resonant) scattering, and bandedge resonances. Specially, the designed 30-dB bandwidth in polarization extinction ratio (PER) of 265 nm is much larger than the spectral width of the PBG (149 nm) due to using the bandedge resonances. The TM mode is in the subwavelength regime of the HUDPC and thus has a low insertion loss (IL). An ultrawide 30-dB bandwidth in PER of 210 nm (1.44-1.65 um) is experimentally demonstrated in a 12.9-um-long HUDPC polarizer with spectrally averaged PER of 39.6 dB and IL for the TM mode of 1.1 dB (IL = 0.6 dB at 1.55 um). The HUDPC polarizers can be an excellent candidate for ultra-broadband polarization filtering in the silicon photonic platform.

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Source: https://tomesphere.com/paper/1908.00759