Gu, Qing

Permanent URI for this collectionhttps://hdl.handle.net/10735.1/6348

Qing Gu is an Assistant Professor in the Department of Electrical and Computer Engineering. She joined the UTD faculty in 2016, and serves as the director of the Nanophotonics Lab. Her research interests include:

  • Quantum behavior analysis in nanostructures
  • Nanophotonic and nanoplasmonic devices
  • Quantum electrodynamics
  • Photonic materials
  • Optical metamaterials
  • Photonic integrated circuits

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2019 recipient of the National Science Foundation CAREER award for her work on an Environmentally Stable Electrically Pumped Perovskite Laser

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Recent Submissions

Now showing 1 - 3 of 3
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    Room Temperature Operation of Directly Patterned Perovskite Distributed Feedback Light Source under Continuous-Wave Optical Pumping
    (Institute of Electrical and Electronics Engineers Inc.) Gharajeh, Abouzar; Haroldson, Ross; Li, Zhitong; Moon, Jiyoung; Balachandran, Balasubramaniam; Hu, Wenchuang (Walter); Zakhidov, Anvar A.; Gu, Qing; 0000 0003 5287 0481 (Zakhidov, AA); 0000-0003-3983-2229 (Zakhidov, AA); 0000-0003-3855-3690 (Gu, Q); Gharajeh, Abouzar; Haroldson, Ross; Li, Zhitong; Moon, Jiyoung; Balachandran, Balasubramaniam; Hu, Wenchuang (Walter); Zakhidov, Anvar A.; Gu, Qing
    We report the first directly patterned perovskite distributed feedback (DFB) resonator with a narrow amplified spontaneous emission (ASE) at pump powers as low as 0.1W/cm², under continuous-wave (CW) optical pumping condition at room temperature.
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    Effective Modal Volume in Nanoscale Photonic and Plasmonic Near-Infrared Resonant Cavities
    (MDPI AG) Li, Xi; Smalley, J. S.; Li, Zhitong; Gu, Qing; 0000-0003-2707-4969 (Li, X); 0000-0003-3855-3690 (Gu, Q); Li, Xi; Li, Zhitong; Gu, Qing
    We survey expressions of the effective modal volume, Veff, commonly used in the literature for nanoscale photonic and plasmonic cavities. We apply different expressions of V_{eff} to several canonical cavities designed for nanoscale near-infrared light sources, including metallo-dielectric and coaxial geometries. We develop a metric for quantifying the robustness of different V_{eff} expressions to the different cavities and materials studied. We conclude that no single expression for V_{eff} is universally applicable. Several expressions yield nearly identical results for cavities with well-confined photonic-type modes. For cavities with poor confinement and a low quality factor, however, expressions using the proper normalization method need to be implemented to adequately describe the diverging behavior of their effective modal volume. The results serve as a practical guideline for mode analysis of nanoscale optical cavities, which show promise for future sensing, communication, and computing platforms.
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    Ultrafast Shifted-Core Coaxial Nano-Emitter
    (Optical Soc Amer) Li, Xi; Gu, Qing; 0000-0003-3855-3690 (Gu, Q); Li, Xi; Gu, Qing
    We present an ultrafast nanoscale light source utilizing a shifted- core coaxial nanocavity, with a footprint of merely one-third of its emission wavelength in all three dimensions at telecommunication wavelengths. We show that, by shifting the metallic core off center of the coaxial structure, the effective mode volume of the cavity can be as small as 0.0078 x (λ₀/n_a)³, resulting in a Purcell factor over 390 and a modulation bandwidth exceeding 60GHz. We further show that the evolution trend of the cavity Q factor as a function of core- shifting distance can be engineered by choosing proper substrate material. Compared to its symmetric counterpart, this shifted-core coaxial nano-cavity features not only higher Q factor, Purcell factor, and modulation bandwidth but also an improved emission directivity that is essential in its coupling with other on-chip components. The proposed nano-emitter also features robust single mode operation over the entire core-shifting range, resulting in a near-unity spontaneous emission factor. Therefore, this device can be a good candidate for low power optical interconnect applications.

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