Related Experiment Video
Updated: Jun 18, 2025
08:21
Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
Published on: March 20, 2015
12.4K
Wavelength tuning of VCSELs via controlled strain
Optics Letters
|August 2, 2024
Summary
Controlled strain in vertical-cavity surface-emitting lasers (VCSELs) enables precise wavelength tuning. This research demonstrates significant wavelength shifts and birefringence changes, offering a method for fine-tuning VCSELs for specific applications.
Area of Science:
- Optics and Photonics
- Semiconductor Devices
- Materials Science
Background:
- Vertical-cavity surface-emitting lasers (VCSELs) offer advantages in telecommunications and emerging fields like neuro-inspired computing.
- Strain engineering is known to influence laser emission properties, including polarization and birefringence.
Purpose of the Study:
- To investigate the impact of applied strain on VCSEL wavelength emission.
- To quantify the sensitivity of VCSEL wavelength to strain.
- To explore strain as a method for fine-tuning VCSEL wavelengths.
Main Methods:
- Comprehensive experimental investigation of strain effects on VCSELs.
- Measurement of wavelength shifts under controlled strain.
- Quantification of birefringence in strained VCSEL structures.
Main Results:
- Demonstrated consistent VCSEL wavelength shifts up to 1 nm.
- Reported strain sensitivity ranging from 0.12 to 0.18 nm/millistrain.
- Measured birefringence values reaching up to 292 GHz.
Conclusions:
- Controlled strain is a viable method for fine-tuning VCSEL wavelengths.
- Strain engineering can potentially simplify the selection of VCSELs for precise wavelength requirements.
- This technique offers a pathway for developing VCSELs tailored to specific spectral needs.
Related Concept Videos
01:27Measurements of Strain
639
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
639
01:27Biasing of Metal-Semiconductor Junctions
235
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
235
01:15Design Example: Strain Gauge Bridge or Wheatstone Bridge
380
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
380