Related Experiment Video
Updated: Sep 13, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
MOCVD-grown InAs/InP quantum dot lasers with low threshold current
Abstract:
We report low-threshold-current, high-yield InAs/InP quantum dot lasers in the C- and L-bands grown by metal-organic chemical vapor deposition (MOCVD). By optimizing the epitaxial growth conditions, including the introduction of a GaAs interfacial layer, we achieved more in-plane symmetric quantum dots with improved optical quality. Deep-etched ridge waveguide lasers with a 4 μm ridge width and top-top metal contacts were fabricated and characterized under pulsed injection. Low threshold currents of 17 mA and 28 mA were obtained for cavity lengths of 300 μm and 1000 μm, respectively. Temperature-dependent measurements showed lasing sustained up to 120 °C with a characteristic temperature T0 of 74.9 K below 90 °C.
Related Concept Videos
MOSFET: Enhancement Mode
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
MOSFET: Depletion Mode
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
Photoluminescence: Applications
MOSFET Amplifiers
Biasing of P-N Junction
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
MOSFET
In an n-MOSFET, the structure includes n-type source and drain...

