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Efficient, Low-Threshold Germanium Laser for Easy Integration of Optical Interconnects
Stanford Reference:
12-191
Abstract
Researchers at Stanford have developed a structure for a Low-Threshold Germanium laser that is easily integrable into electronic and photonic circuits, and competitive with current state-of-the-art III-V lasers. Key aspects of optical interconnects, such as high performance photo detector and modulators, have been integrated on a silicon-compatible platform. However, materials used in today’s lasers, such as gallium arsenide, are very challenging to integrate. Until now, an efficient light source that is compatible with CMOS fabrication has proved elusive. This technology uses a low threshold Ge laser with a crossed nanobeam structure to create tensile strain that reduces the threshold current density below approximately 1kA/cm2 - comparable with current state-of-the-art lasers. This new Ge laser can be fabricated directly on silicon, with applications in silicon-compatible optical interconnects, bringing us closer to computers that use light instead of electricity to move data.
Crossed nanobeam structure for a low-threshold germanium laser
(Si substrate, Ge nanobeam laser shown in blue and SiN crossed beam in red.)
Applications
Low-threshold Ge lasers
Wavelength-tunable electro-optic devices, such as modulators and light sources
Advantages
CMOS compatible fabrication
Superior efficiency - threshold current density reduced by a factor of 10-100 compared to the existing Ge lasers
Wavelength-tunable
Applicable to other indirect band gap semiconductors
Publications
Nam, D., D. S. Sukhdeo, B. R. Dutt, and K. C. Saraswat.
"(Invited) Light Emission from Highly-Strained Germanium for On-Chip Optical Interconnects."
ECS Transactions 64, no. 6 (2014): 371-381.
Nam, Donguk
STRAINED GERMANIUM TECHNOLOGY FOR ON-CHIP OPTICAL INTERCONNECTS
Stanford Univeristy (2013).
Nam, Donguk, David Sukhdeo, Szu-Lin Cheng, Arunanshu Roy, Kevin Chih-Yao Huang, Mark Brongersma, Yoshio Nishi, and Krishna Saraswat.
"Electroluminescence from strained germanium membranes and implications for an efficient Si-compatible laser."
Applied Physics Letters 100, no. 13 (2012): 131112.
Related Web Links
Nanoscale and Quantum Photonics Lab
Jelena Vuckovic
Innovators & Portfolio
Shashank Gupta
Donguk Nam
Jan Petykiewicz
more technologies from Jan Petykiewicz »
Krishna Saraswat
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Devanand Sukhdeo
Jelena Vuckovic
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Patent Status
Issued : 9,595,812 (USA)
Date Released
6/7/2018 12:00
Licensing Contact
Luis Mejia, Senior Licensing Manager, Physical Sciences
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Related Keywords
PS: semiconductor: optical
PS: quantum computing
PS: thin film: optoelectronics
PS: photonics: nanophotonics
PS: photonics: lasers
PS: communications: optical interconnects
optical modulator
semiconductor: laser
nanostructure
laser diodes