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THz time-domain characterization of amplifying quantum-cascade metasurface

https://doi.org/10.1063/5.0067690

Shen, Yue; Kim, Anthony D.; Shahili, Mohammad; Curwen, Christopher A.; Addamane, Sadhvikas; Reno, John L.; Williams, Benjamin S. (November 2021, Applied Physics Letters)
Tunable quantum-cascade VECSEL operating at 1.9 THz

https://doi.org/10.1364/OE.438636

Wu, Yu; Shen, Yue; Addamane, Sadhvikas; Reno, John_L; Williams, Benjamin_S (October 2021, Optics Express)

We report a terahertz quantum-cascade vertical-external-cavity surface-emitting laser (QC-VECSEL) emitting around 1.9 THz with up to 10% continuous fractional frequency tuning of a single laser mode. The device shows lasing operation in pulsed mode up to 102 K in a high-quality beam, with the maximum output power of 37 mW and slope efficiency of 295 mW/A at 77 K. Challenges for up-scaling the operating wavelength in QC metasurface VECSELs are identified.
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Electrical and optical characterizations of spin-orbit torque

https://doi.org/10.1063/5.0045091

Huang, Hanshen; Wu, Hao; Yu, Tian; Pan, Quanjun; Dai, Bingqian; Razavi, Armin; Wong, Kin; Cui, Baoshan; Chong, Su Kong; Wu, Di; et al (February 2021, Applied Physics Letters)
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Large exchange splitting in monolayer graphene magnetized by an antiferromagnet

https://doi.org/10.1038/s41928-020-0458-0

Wu, Yingying; Yin, Gen; Pan, Lei; Grutter, Alexander J.; Pan, Quanjun; Lee, Albert; Gilbert, Dustin A.; Borchers, Julie A.; Ratcliff, William; Li, Ang; et al (October 2020, Nature Electronics)

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