Shape Engineered InAs Quantum Dots with Stabilized Electronic Properties

Vadim E. Tokranov; Michael Yakimov; Alex Katsnelson; Matthew Lamberti; Serge Oktyabrsky

doi:10.1117/12.477795

1 July 2003 Shape Engineered InAs Quantum Dots with Stabilized Electronic Properties

Vadim E. Tokranov, Michael Yakimov, Alex Katsnelson, Matthew Lamberti, Serge Oktyabrsky

Proceedings Volume 4999, Quantum Sensing: Evolution and Revolution from Past to Future; (2003) https://doi.org/10.1117/12.477795
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States

Abstract

We have studied the influence of overgrowth procedure and a few monolayer-thick AlAs capping layers on the properties of self-assembled InAs quantum dots (QDs) using transmission electron microscopy (TEM), scanning electron microscopy, and photoluminescence (PL). PL spectroscopy was used to study and optimize optical properties of the QDs by shape engineering (QD truncation) through adjustment of the thickness of overlayers and temperature of the subsequent heating. QDs with 6 nm-thick overlayer with heating step at 560°C was found to have the highest PL intensity at room temperature and the lowest FWHM, 29 meV. Ground state energy of the truncated QDs is very stable against variations of growth parameters. TEM measurements show that the capping AlAs layer covers the QDs entirely even though the dots are truncated by the heating step. 1.22 μm edge-emitting laser with triple-layer truncated QD gain medium demonstrated room temperature minimum threshold current density, 56 A/cm², and high saturated modal gain, 16 cm^-1. Extremely high characteristic temperature, T_o = 304 K in the 20 - 60°C interval, and maximum lasing temperature of 219°C were measured for this laser diode.

Citation Download Citation

Vadim E. Tokranov, Michael Yakimov, Alex Katsnelson, Matthew Lamberti, and Serge Oktyabrsky "Shape Engineered InAs Quantum Dots with Stabilized Electronic Properties", Proc. SPIE 4999, Quantum Sensing: Evolution and Revolution from Past to Future, (1 July 2003); https://doi.org/10.1117/12.477795

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available