Measurement of the quantum-confined Stark effect in InAs/In(Ga)As quantum dots with p-doped quantum dot barriers

Mahoney, Joe, Tang, Mingchu, Liu, Huiyun and Abadia, Nicolas ORCID: https://orcid.org/0000-0002-7355-4245 2022. Measurement of the quantum-confined Stark effect in InAs/In(Ga)As quantum dots with p-doped quantum dot barriers. Optics Express 30 (11) , pp. 17730-17738. 10.1364/OE.455491

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Abstract

he quantum-confined Stark effect in InAs/In(Ga)As quantum dots (QDs) using non-intentionally doped and p-doped QD barriers was investigated to compare their performance for use in optical modulators. The measurements indicate that the doped QD barriers lead to a better figure of merit (FoM), defined as the ratio of the change in absorption Δα for a reverse bias voltage swing to the loss at 1 V α(1 V), FoM=Δα/α (1 V). The improved performance is due to the absence of the ground-state absorption peak and an additional component to the Stark shift. Measurements indicate that p-doping the QD barriers can lead to more than a 3x increase in FoM modulator performance between temperatures of −73 °C to 100 °C when compared with the stack with NID QD barriers.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Optica
ISSN:	1094-4087
Funders:	EPSRC
Date of First Compliant Deposit:	7 June 2022
Date of Acceptance:	30 March 2022
Last Modified:	24 May 2023 00:28
URI:	https://orca.cardiff.ac.uk/id/eprint/150270

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