Increasing Light Absorption and Collection Using Engineered Structures

Noori, Yasir and Woodhead, Christopher Stephen and Young, Robert James (2018) Increasing Light Absorption and Collection Using Engineered Structures. In: Two-dimensional Materials for Photodetector. InTech, pp. 193-212. ISBN 9789535139522

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Abstract

In recent years we have witnessed an explosion of interest in two dimensional (2D) materials, due to their unique physical properties. Excitement surrounds the promise of replacing conventional bulk photodetectors with devices based on 2D materials, allowing better integration, flexibility and potentially improving performance. However, the low inherent light absorption of 2D materials is an outstanding issue to be solved. In this chapter we review two independent approaches to tackling this problem, which have the potential to be combined to find a robust solution. The first approach involves patterning the substrate with a rod-type photonic crystal (PhC) cavity structure, which is shown to increase the light absorption into a 2D material flake coupled spatially to the cavity mode. Secondly, we review 2D–compatible solid immersion lenses (SILs) and their ability to increase both the optical magnification of the structures they encapsulate, and the longevity of the material. SILs have been shown to reduce the requirements for complex optics in the implementation of 2D materials in optoelectronic devices, and also in preserving the photodetector’s optical performance over long periods of time. Finally, we show how by combining rod-type PhC cavities with SILs, we can improve the performance of 2D material-based photodetectors.

Item Type:
Contribution in Book/Report/Proceedings
Subjects:
ID Code:
124395
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Deposited On:
04 Apr 2018 15:42
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Nov 2020 11:40