Low-threshold optically pumped lasing in highly strained germanium nanowires

Shuyu Bao, Daeik Kim, Chibuzo Onwukaeme, Shashank Gupta, Krishna Saraswat, Kwang Hong Lee, Yeji Kim, Dabin Min, Yongduck Jung, Haodong Qiu, Hong Wang, Eugene A. Fitzgerald, Chuan Seng Tan () and Donguk Nam ()
Additional contact information
Shuyu Bao: Nanyang Technological University
Daeik Kim: Inha University
Chibuzo Onwukaeme: Inha University
Shashank Gupta: Stanford University
Krishna Saraswat: Stanford University
Kwang Hong Lee: Singapore-MIT Alliance for Research and Technology (SMART)
Yeji Kim: Inha University
Dabin Min: Inha University
Yongduck Jung: Inha University
Haodong Qiu: Nanyang Technological University
Hong Wang: Nanyang Technological University
Eugene A. Fitzgerald: Singapore-MIT Alliance for Research and Technology (SMART)
Chuan Seng Tan: Nanyang Technological University
Donguk Nam: Nanyang Technological University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract The integration of efficient, miniaturized group IV lasers into CMOS architecture holds the key to the realization of fully functional photonic-integrated circuits. Despite several years of progress, however, all group IV lasers reported to date exhibit impractically high thresholds owing to their unfavourable bandstructures. Highly strained germanium with its fundamentally altered bandstructure has emerged as a potential low-threshold gain medium, but there has yet to be a successful demonstration of lasing from this seemingly promising material system. Here we demonstrate a low-threshold, compact group IV laser that employs a germanium nanowire under a 1.6% uniaxial tensile strain as the gain medium. The amplified material gain in strained germanium can sufficiently overcome optical losses at 83 K, thus allowing the observation of multimode lasing with an optical pumping threshold density of ~3.0 kW cm−2. Our demonstration opens new possibilities for group IV lasers for photonic-integrated circuits.

Date: 2017
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DOI: 10.1038/s41467-017-02026-w

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