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Mid-Infrared Emission Dynamics of InAs Nanowire Lasers
Hisashi Sumikura1,2, Guoqiang Zhang1,2, Masato Takiguchi1,2
1NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan.
Nano Letters
|August 4, 2025
Summary
Researchers observed picosecond mid-infrared (MIR) emissions from indium arsenide (InAs) nanowire lasers. These nanolasers demonstrate potential for high-speed operation, emitting ultrafast pulses above a specific pump threshold.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Understanding ultrafast emission dynamics in nanolasers is crucial for developing advanced optical devices.
- Indium arsenide (InAs) nanowires are promising materials for mid-infrared (MIR) optoelectronic applications.
Purpose of the Study:
- To investigate the time-resolved emission characteristics of wurtzite InAs nanowire lasers in the MIR spectrum.
- To analyze the transition from spontaneous to stimulated emission and identify the factors influencing ultrafast pulse generation.
Main Methods:
- Utilized time-resolved emission measurements employing a wavelength up-conversion technique.
- Observed emission intensity, spectral characteristics, and temporal profiles of InAs nanowires under pulsed optical pumping.
- Performed numerical simulations to interpret the observed emission phenomena.
Main Results:
- An abrupt increase in MIR emission intensity was observed above a pump fluence threshold of 53 μJ cm⁻²/pulse.
- Below threshold, emissions showed broad spectra and exponential decay attributed to spontaneous emission and surface recombination.
- Above threshold, intense, sharp spectral peaks and ultrafast pulses as short as 8 picoseconds (ps) were detected, indicative of stimulated emission.
Conclusions:
- The study confirms stimulated emission in InAs nanowire lasers, generating intense picosecond MIR pulses.
- Results enhance the understanding of ultrafast emission dynamics in MIR nanolasers.
- InAs nanowire lasers show significant potential for high-speed optical applications.
