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Increasing Light Absorption and Collection Using Engineered Structures

Increasing Light Absorption and Collection Using Engineered Structures
Increasing Light Absorption and Collection Using Engineered Structures
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.
2D materials, Photodetectors, Solid immersion lens, Photonic Crystals
193-212
IN TECH
Noori, Yasir
704d0b70-1ea6-4e00-92ce-cc2543087a09
Woodhead, Christopher S.
7a034c66-eefb-4d2a-b6a1-e8e7402076fe
Young, Robert
bee24f8d-caf2-4842-8cc2-c204a7a5795c
Kumar Nayak, Parmoda
Noori, Yasir
704d0b70-1ea6-4e00-92ce-cc2543087a09
Woodhead, Christopher S.
7a034c66-eefb-4d2a-b6a1-e8e7402076fe
Young, Robert
bee24f8d-caf2-4842-8cc2-c204a7a5795c
Kumar Nayak, Parmoda

Noori, Yasir, Woodhead, Christopher S. and Young, Robert (2018) Increasing Light Absorption and Collection Using Engineered Structures. In, Kumar Nayak, Parmoda (ed.) Two-dimensional materials for photodetectors. London, UK. IN TECH, pp. 193-212. (doi:10.5772/intechopen.73079).

Record type: Book Section

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.

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More information

e-pub ahead of print date: 4 April 2018
Published date: April 2018
Keywords: 2D materials, Photodetectors, Solid immersion lens, Photonic Crystals

Identifiers

Local EPrints ID: 425667
URI: http://eprints.soton.ac.uk/id/eprint/425667
PURE UUID: b48ed097-94f2-47da-ad20-27253ede321f
ORCID for Yasir Noori: ORCID iD orcid.org/0000-0001-5285-8779

Catalogue record

Date deposited: 31 Oct 2018 17:30
Last modified: 07 Aug 2020 01:49

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Contributors

Author: Yasir Noori ORCID iD
Author: Christopher S. Woodhead
Author: Robert Young
Editor: Parmoda Kumar Nayak

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