Related Experiment Video
Updated: Jul 15, 2026
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Multiwavelength ultralow-threshold lasing in quantum dot photonic crystal microcavities
S Chakravarty1, P Bhattacharya, S Chakrabarti
1Solid State Electronics Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan 48109-2122, USA. chakrast@umich.edu
Optics Letters
|April 19, 2007
Summary
Researchers achieved multiwavelength lasing in a 2D photonic crystal microcavity using quantum dots. This photonic crystal (PC) slab demonstrated ultralow-threshold lasing, paving the way for efficient light sources.
Area of Science:
- Photonics
- Materials Science
- Quantum Optics
Background:
- Photonic crystals (PCs) offer unique light manipulation properties.
- Microcavities confine light, enhancing light-matter interactions.
- Quantum dots are efficient light emitters suitable for optoelectronic devices.
Purpose of the Study:
- To demonstrate multiwavelength lasing in a linear (L3) microcavity within a triangular-lattice 2D photonic crystal slab.
- To investigate the impact of optical excitation intensity on the emission spectrum of coupled quantum dots modified by the PC microcavity.
Main Methods:
- Fabrication of a triangular-lattice 2D photonic crystal slab with linear (L3) microcavities.
- Utilizing coupled quantum dots as the gain medium within the microcavity.
- Studying the spontaneous emission spectrum under varying incident optical excitation intensities.
Main Results:
- Observation of multiwavelength lasing from resonant modes in the L3 microcavity.
- Achieved ultralow-threshold lasing power of approximately 600 nW.
- Observed an output efficiency of approximately 3% at threshold.
- Identified two additional resonant modes with weaker turn-on characteristics and thresholds of approximately 2.5 µW and 200 µW.
Conclusions:
- The demonstrated photonic crystal microcavity supports efficient multiwavelength lasing.
- The ultralow threshold power highlights the potential for low-power optical devices.
- The results suggest promising applications in integrated photonics and optoelectronics.
