Finite-Difference Time-Domain Modeling of Periodic and Disordered Surface Gratings in AlInSb Light Emitting Diodes With Metallic Back-Reflectors

Author

Buss, Ian J. ; Nash, Geoffrey R. ; Rarity, John G. ; Cryan, Martin J.

Author_Institution

Dept. of Electr. & Electron. Eng., Univ. of Bristol, Bristol, UK

Volume

28

Issue

8

fYear

2010

fDate

4/15/2010 12:00:00 AM

Firstpage

1190

Lastpage

1200

Abstract

Two-dimensional finite-difference time-domain modeling is undertaken to study the optical behaviour of midinfrared AlInSb light-emitting diode devices with close metallic back reflectors. The location of the source and mirror is investigated in detail and optimised for peak emission at ??₀ = 4 ??m. A periodic surface grating is added and it is found that greater than 98% of the light at a specific wavelength may be extracted for specific grating parameters, an enhancement of ~ 20-fold. A novel type of grating termed disordered-periodic is then studied and is shown to have a much broader spectral response with more than 50% of the power extracted across a broad wavelength range.

Keywords

III-V semiconductors; aluminium compounds; diffraction gratings; finite difference time-domain analysis; indium compounds; integrated optoelectronics; light emitting diodes; mirrors; periodic structures; 2D finite-difference time-domain modeling; AlInSb; broader spectral response; disordered-periodic surface grating; metallic back-reflector; midinfrared light-emitting diode; mirror; power extraction; Finite-difference time-domain modeling; integrated optoelectronics; light-emitting diodes;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2010.2040803

Filename

5404792