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arXiv · 2411.09795

InGaAs and GaAsSb PIN Nanowire Arrays with Large Absorption around 1.55 μ m for Room Temperature Infrared Applications

Shrivatch Sankar·Punam Murkute·Nathan Gajowski·Micah Meleski·Md. Saiful Islam Sumon·John Mcelearney·Lawrence Qiu·Neha Nooman·Paul J. Simmonds·Ronald M. Reano·Sanjay Krishna·Shamsul Arafin
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Abstract

We report a comparative analysis between InGaAs and GaAsSb-based top-down cylindrical nanowire arrays fabricated from p-i-n heterostructures. Optical constants measured via spectroscopic ellipsometry were incorporated into FDTD simulations to optimize array geometries. Simulations indicated that GaAsSb nanowire arrays with a diameter of 314 nm and a period of 904 nm achieved a peak absorption of 98% at 1550 nm, while InGaAs nanowire arrays with a 326 nm diameter and 1090 nm period reached 76%. Measurements of fabricated arrays showed absorption of 89% at 1628 nm (GaAsSb) and enhanced sub-bandgap absorption at 1766 nm (InGaAs) at room temperature. These results were confirmed through modelling of the as-fabricated nanowire diameters 330 nm and 411 nm, demonstrating excellent agreement between theory and experiment. In both material platforms, nano-structuring improved the absorption relative to planar films, demonstrating near-unity absorption suitable for practical single-photon detection.

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Shrivatch Sankar, Punam Murkute, Nathan Gajowski, Micah Meleski, Md. Saiful Islam Sumon, John Mcelearney, Lawrence Qiu, Neha Nooman, Paul J. Simmonds, Ronald M. Reano, Sanjay Krishna, Shamsul Arafin. 2026-09-14. InGaAs and GaAsSb PIN Nanowire Arrays with Large Absorption around 1.55 μ m for Room Temperature Infrared Applications. https://arxiv.org/abs/2411.09795

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