High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves
Abstract
Terahertz semiconductor quantum-cascade lasers (QCLs) are widely implemented with metallic cavities that support low-loss plasmonic optical modes at long wavelengths. However, resonant optical modes in such cavities suffer from poor radiative characteristics due to their subwavelength transverse dimensions. Consequently, single-mode terahertz QCLs with metallic cavities and large (>100 mW) output power have only been realized in the surface-emitting configuration that affords a large radiating surface. Here, we demonstrate a method to enhance radiative outcoupling from such plasmonic lasers for high-power emission in the edge-emitting (end-fire or longitudinal) direction. Single-sided plasmon waves propagating in vacuum are resonantly excited in surrounding medium of metallic cavities with the QCL semiconductor medium. The vacuum guided plasmon waves with a large wavefront phase-lock multiple metallic cavities longitudinally, which leads to intense radiation in multiple directions, including that in the longitudinal direction in a narrow single-lobed beam. The multicavity array radiates predominantly in a single spectral mode. A peak-power output of 260 mW and a slope efficiency of 303 mW/A are measured for the end-fire beam from a 3.3 THz QCL operating at 54 K in a Stirling cooler. Finally, single-mode operation and lithographic tuning across a bandwidth of ~150 GHz are demonstrated.
- Authors:
-
- Lehigh Univ., Bethlehem, PA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1618091
- Report Number(s):
- SAND-2020-0623J
Journal ID: ISSN 0003-6951; 682967; TRN: US2200930
- Grant/Contract Number:
- AC04-94AL85000; ECCS 1609168; ECCS 1351142; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 13; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Jin, Yuan, Zhu, Qiyao, Reno, John L., and Kumar, Sushil. High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves. United States: N. p., 2020.
Web. doi:10.1063/1.5142860.
Jin, Yuan, Zhu, Qiyao, Reno, John L., & Kumar, Sushil. High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves. United States. https://doi.org/10.1063/1.5142860
Jin, Yuan, Zhu, Qiyao, Reno, John L., and Kumar, Sushil. Tue .
"High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves". United States. https://doi.org/10.1063/1.5142860. https://www.osti.gov/servlets/purl/1618091.
@article{osti_1618091,
title = {High power edge-cum-surface emitting terahertz laser arrays phased locked by vacuum guided plasmon waves},
author = {Jin, Yuan and Zhu, Qiyao and Reno, John L. and Kumar, Sushil},
abstractNote = {Terahertz semiconductor quantum-cascade lasers (QCLs) are widely implemented with metallic cavities that support low-loss plasmonic optical modes at long wavelengths. However, resonant optical modes in such cavities suffer from poor radiative characteristics due to their subwavelength transverse dimensions. Consequently, single-mode terahertz QCLs with metallic cavities and large (>100 mW) output power have only been realized in the surface-emitting configuration that affords a large radiating surface. Here, we demonstrate a method to enhance radiative outcoupling from such plasmonic lasers for high-power emission in the edge-emitting (end-fire or longitudinal) direction. Single-sided plasmon waves propagating in vacuum are resonantly excited in surrounding medium of metallic cavities with the QCL semiconductor medium. The vacuum guided plasmon waves with a large wavefront phase-lock multiple metallic cavities longitudinally, which leads to intense radiation in multiple directions, including that in the longitudinal direction in a narrow single-lobed beam. The multicavity array radiates predominantly in a single spectral mode. A peak-power output of 260 mW and a slope efficiency of 303 mW/A are measured for the end-fire beam from a 3.3 THz QCL operating at 54 K in a Stirling cooler. Finally, single-mode operation and lithographic tuning across a bandwidth of ~150 GHz are demonstrated.},
doi = {10.1063/1.5142860},
journal = {Applied Physics Letters},
number = 13,
volume = 116,
place = {United States},
year = {Tue Mar 31 00:00:00 EDT 2020},
month = {Tue Mar 31 00:00:00 EDT 2020}
}
Web of Science
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