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Analysis of Contact Interfaces for Single GaN Nanowire Devices

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Published on: November 15, 2013

Length dependent optical characteristics analysis for semiconductor nanowires.

Navneet Dhindsa^1,2, Reza Kohandani¹, Simarjeet S Saini¹

¹Department of Electrical and Computer Engineering, University of Waterloo, 200, University Avenue West, Waterloo, ON, N2L 3G1, Canada.

|February 14, 2020

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Semiconductor nanowire length significantly impacts optical absorption. Radial modes dominate absorption above 200 nm, while shorter lengths show scattering, and longitudinal modes influence absorption in materials like silicon.

Area of Science:

Nanophotonics
Materials Science
Solid State Physics

Background:

Optical absorption in semiconductor nanowires is crucial for optoelectronic devices.
Previous studies focused on diameter-dependent radial modes for enhanced absorption.
The influence of nanowire length on optical absorption modes remains less understood.

Purpose of the Study:

To investigate the effect of nanowire length on resonant wavelength and peak absorption.
To determine the minimum length for radial optical mode stabilization and dominance.
To assess the role of longitudinal modes in absorption characteristics and resonant wavelengths.

Main Methods:

Theoretical analysis of optical mode excitations in silicon and gallium arsenide nanowires.

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Simulation of absorption and scattering characteristics across varying nanowire lengths and diameters.

Comparison of optical properties between high and low absorption semiconductor materials.

Main Results:

Radial mode excitation dominates absorption for nanowires longer than 200 nm.
Optical characteristics are dominated by scattering for lengths below 200 nm.
Longitudinal modes influence absorption in silicon nanowires up to 700 nm, with shorter lengths potentially showing higher absorption.
Scattering losses are minimal (<2%) for both materials.

Conclusions:

Nanowire length is a critical parameter controlling optical absorption modes.
Radial modes are established early, but longitudinal modes play a role in specific materials and lengths.
Understanding these length-dependent effects is key for optimizing nanowire-based devices.