Design of a silicon-on-calcium-fluoride-based ultracompact and highly efficient polarization splitter for the midinfrared

Babita Kumari; Ravendra K. Varshney; Bishnu P. Pal

doi:10.1117/1.OE.58.3.037102

15 March 2019 Design of a silicon-on-calcium-fluoride-based ultracompact and highly efficient polarization splitter for the midinfrared

Babita Kumari, Ravendra K. Varshney, Bishnu P. Pal

Author Affiliations +

Optical Engineering, Vol. 58, Issue 3, 037102 (March 2019). https://doi.org/10.1117/1.OE.58.3.037102

Abstract

Design of a silicon-based ultracompact polarization splitter (PS) with high extinction ratio (ER) is proposed for the midinfrared-operating wavelength of 4.47 μm. It is based on a directional coupler (DC) that consists of a horizontal slot waveguide (WG) and a strip WG with Si as the core material and CaF₂ as the slot and substrate material. By choosing appropriate structural parameters, we have designed the DC-PS such that only the TM polarization satisfies the phase-matching condition for coupling at the targeted wavelength of 4.47 μm; achieved ERs are ∼41.6 dB and ∼37.1 dB for the cross-coupled and the throughput ports, respectively. Corresponding estimated insertion losses (ILs) are ∼0.25 dB and ∼0.07 dB in a device length of just ∼6.6 μm. Over a broad bandwidth of 200 nm (4.37 to 4.57 μm) in the mid-IR, our designed PS exhibited ER of >37 dB (with IL of <0.5 dB) for the cross-coupled port and an ER of >17 dB (with IL of <0.1 dB) for the throughput port. Numerical estimations revealed excellent tolerance to the potential fabrication errors.

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Babita Kumari, Ravendra K. Varshney, and Bishnu P. Pal "Design of a silicon-on-calcium-fluoride-based ultracompact and highly efficient polarization splitter for the midinfrared," Optical Engineering 58(3), 037102 (15 March 2019). https://doi.org/10.1117/1.OE.58.3.037102

Received: 28 September 2018; Accepted: 27 February 2019; Published: 15 March 2019

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