High-power terahertz pulse generation from bias-free nanoantennas on graded composition InGaAs structures
Abstract
We present a bias-free photoconductive emitter that uses an array of nanoantennas on an InGaAs layer with a linearly graded Indium composition. The graded InGaAs structure creates a built-in electric field that extends through the entire photoconductive active region, enabling the efficient drift of the photo-generated electrons to the nanoantennas. The nanoantenna geometry is chosen so that surface plasmon waves are excited in response to a 1550 nm optical pump to maximize photo-generated carrier concentration near the nanoantennas, where the built-in electric field strength is maximized. With the combination of the plasmonic enhancement and built-in electric field, high-power terahertz pulses are generated without using any external bias voltage. We demonstrate the generation of terahertz pulses with 860 µW average power at an average optical pump power of 900 mW, exhibiting the highest radiation power compared to previously demonstrated telecommunication-compatible terahertz pulse emitters.
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); US Department of the Navy, Office of Naval Research (ONR); Burroughs Wellcome Fund
- OSTI Identifier:
- 1842531
- Alternate Identifier(s):
- OSTI ID: 1980975; OSTI ID: 2001456
- Grant/Contract Number:
- SC0016925; N000141912052
- Resource Type:
- Published Article
- Journal Name:
- Optics Express
- Additional Journal Information:
- Journal Name: Optics Express Journal Volume: 30 Journal Issue: 2; Journal ID: ISSN 1094-4087
- Publisher:
- Optical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; optics
Citation Formats
Lu, Ping-Keng, Turan, Deniz, and Jarrahi, Mona. High-power terahertz pulse generation from bias-free nanoantennas on graded composition InGaAs structures. United States: N. p., 2022.
Web. doi:10.1364/OE.447733.
Lu, Ping-Keng, Turan, Deniz, & Jarrahi, Mona. High-power terahertz pulse generation from bias-free nanoantennas on graded composition InGaAs structures. United States. https://doi.org/10.1364/OE.447733
Lu, Ping-Keng, Turan, Deniz, and Jarrahi, Mona. Wed .
"High-power terahertz pulse generation from bias-free nanoantennas on graded composition InGaAs structures". United States. https://doi.org/10.1364/OE.447733.
@article{osti_1842531,
title = {High-power terahertz pulse generation from bias-free nanoantennas on graded composition InGaAs structures},
author = {Lu, Ping-Keng and Turan, Deniz and Jarrahi, Mona},
abstractNote = {We present a bias-free photoconductive emitter that uses an array of nanoantennas on an InGaAs layer with a linearly graded Indium composition. The graded InGaAs structure creates a built-in electric field that extends through the entire photoconductive active region, enabling the efficient drift of the photo-generated electrons to the nanoantennas. The nanoantenna geometry is chosen so that surface plasmon waves are excited in response to a 1550 nm optical pump to maximize photo-generated carrier concentration near the nanoantennas, where the built-in electric field strength is maximized. With the combination of the plasmonic enhancement and built-in electric field, high-power terahertz pulses are generated without using any external bias voltage. We demonstrate the generation of terahertz pulses with 860 µW average power at an average optical pump power of 900 mW, exhibiting the highest radiation power compared to previously demonstrated telecommunication-compatible terahertz pulse emitters.},
doi = {10.1364/OE.447733},
journal = {Optics Express},
number = 2,
volume = 30,
place = {United States},
year = {Wed Jan 05 00:00:00 EST 2022},
month = {Wed Jan 05 00:00:00 EST 2022}
}
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