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Single-Mode Emission in InP Microdisks on Si Using Au Antenna
Preksha Tiwari1, Anna Fischer1, Markus Scherrer1
1IBM Research Europe-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
ACS Photonics
|April 28, 2022
Summary
Gold nanorod antennae on indium phosphide lasers enable stable, single-mode emission on silicon, overcoming challenges in on-chip photonic applications by suppressing side modes and improving temperature stability.
Area of Science:
- Photonics
- Materials Science
- Nanotechnology
Background:
- Whispering gallery mode (WGM) cavities are crucial for on-chip photonic applications, offering small footprints and low lasing thresholds.
- III-V materials on Silicon (Si) enable integrated photonic devices, but face challenges with multimodal emission and temperature-dependent wavelength stability.
Purpose of the Study:
- To investigate the use of gold (Au) nanorod antennae on Indium Phosphide (InP) WGM lasers on Si.
- To achieve stable, single-mode emission and enhance wavelength stability over a broad temperature range.
Main Methods:
- Fabrication of InP WGM lasers on Si substrates.
- Integration of Au nanorod antennae of varying sizes and positions onto the laser cavities.
- Characterization of optical emission spectra, far-field radiation patterns, and temperature-dependent performance.
Main Results:
- Au nanorod antennae effectively suppress side modes, enabling single-mode emission from the WGM cavities.
- Antenna size and positioning are critical for mode selection and emission control.
- Antenna-integrated lasers demonstrate dominant single-mode emission from 300 K down to 200 K.
- Devices with antennae exhibit significantly different far-field radiation patterns compared to bare cavities.
- Bare cavities show multimodal emission and highly temperature-dependent wavelength shifts.
Conclusions:
- Au nanorod antennae are a viable strategy for achieving single-mode emission in InP WGM lasers on Si.
- This approach significantly improves wavelength stability over a wide temperature range, crucial for robust photonic applications.
- The integration of plasmonic antennae offers a pathway to overcome limitations in current on-chip laser technology.
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