Yun Gao

Electronical and Computer Engineering, University of California, San Diego, 92093

add4lv@r.postjobfree.com 858-***-**** https://www.linkedin.com/in/yun-gao-97690413b/ SUMMARY

• Optics/Photonics researcher with 5+ years working experience in cleanroom fabrication, commercial foundry tapeout, and key specialties in silicon/silicon nitride photonic active and passive components design, 2D material optoelectronic devices design, on-wafer optical, electrical and high-frequency characterizations.

• Excellent team player and strong builder of prolific collaborations in different aspects of basic and applied research to long-lasting research projects >12 scientific publications.

• Creative and self-motivated individual with detail-oriented mindset, analytical skills and proven ability to meet tight deadlines by working in a fast-paced work environment. TECHNICAL

SKILLS

Optical device design, photonic integrated chip layout, and fabrication

• Optical simulation with Lumerical (FDTD, MODE, DEVICE, INTERCONNECT), COMSOL, VPIphotonics, Rsoft and Zemax, RF electromagnetic field and circuit simulation with ANSYS HFSS

• Device layout generation (Cadence, KLayout, and IPKISS)

• Design with respect to commercial foundry DRC rules, such as TowerJazz

• 5+ years full-time working experience in cleanroom, expertly using electron beam lithography, photolithography, reactive ion etching, electron-beam evaporator, thermal evaporator, PECVD, sputter, SEM, Raman spectroscopy, AFM

• 2D material transfer, assembly, and characterization High-speed characterization and performance analysis

• High-speed characterizations such as impulse responses with femtosecond laser, S- parameter measurements with Vector Network Analyzer

• Lab test automation, data collection and analysis with MATLAB, Labview, and Python PROFESSIONAL

EXPERIENCE

Postdoc. Researcher, Photonics Systems Group, UCSD Sep. 2019–Present Advisor: Prof. Stojan Radic

Low-power silicon photonics device development for transceivers:

• Developed 16- and 32-channel 50 GHz MZI and ring (De)Multiplexers with phase error correction, achieved small footprint (200*200 µm2 per channel), < –25 dB crosstalk, and 1-dB bandwidth of 35 GHz;

• Constructed 50-GHz, 100-GHz, 200-GHz MZI and AWG cascaded (De)Multiplexers with 8 and 16 channels;

• Executed Ge Avalanche photodetector (APD) design. Integrated frequency comb for coherent communication system:

• Modeled the silicon frequency comb generation by solving the nonlinear Schrodinger equation;

• Constructed the signal recovery by using the master seed to clone the generated comb lines (on going).

Ph.D. Research Assistant, Photonics Laboratory, CUHK Aug. 2015–Jul. 2019 Advisor: Prof. Chester Shu

High-speed van der Waals heterostructure tunneling photodiode integrated on silicon nitride waveguide:

• Designed and fabricated a van der Waals heterostructure tunneling photodiode working in telecom wavelengths which achieved a responsivity of 0.24 A/W, a bandwidth of 56 GHz, and an on/off current ratio exceeding 10,000. Carrier dynamics of high-speed graphene waveguide photodetectors:

• Built a carrier dynamics model for graphene photodetectors integrated on waveguides, analyzed the limitations of device responsivity and bandwidth;

• Executed and fabricated graphene photodetectors with interdigital and asymmetric metal contacts, which obtained improved responsivity and bandwidth experimentally. High-performance CVD graphene-on-SiN waveguide photodetectors:

• Constructed the first high-speed graphene-on-SiN waveguide photodetectors and achieved a responsivity of 15 mA/W and a bandwidth of 30 GHz at ~1550 nm. Cavity-enhanced thermo-optic bistability and hysteresis in graphene-on-SiN ring resonators:

• Modeled the nonlinear phenomena in the SiN ring resonator by using the time-domain nonlinear coupled mode theory; Simulated the steady-state temperature distribution in COMSOL;

• Achieved two-fold enhancement in the thermo-optic resonance shift rate and 18-fold increase in the effective thermal nonlinear refractive index;

• Investigated the hysteresis loop associated with the optical bistability. Ph.D. Visiting Student, University of Washington Oct. 2018–Mar. 2019 Advisor: Prof. Arka Majumdar

Thin-film EO modulator for spatial light modulation, LIDAR, and tunable metalens:

• Designed and characterized EO polymer for high-speed spatial light modulation, LIDAR, and tunable metalens.

Directly modulated quantum dots light emitters, LEDs, nanolasers:

• Designed directly modulated quantum dots light emitters, LEDs;

• Measured photoluminescence and electroluminescence of quantum dots;

• Designed photonic crystal nanobeam cavities on silicon nitride for the nanolasers. Optical Engineer, XGIGA Communication Technology CO., LT Summer Intern 2018

• Conducted failure analysis of 10G EML TOSA;

• Designed the optical path for 2.5G EML TOSA by using Zemax. EDUCATION Chinese University of Hong Kong Hong Kong SAR Ph.D. in Electronic Engineering Aug.2015–July 2019 University of Washington, Seattle Seattle, WA

Ph.D. Visiting Student in Electrical and Computer Engineering Oct. 2018–Mar. 2019 Dalian University of Technology Dalian, China

B.S. in Communications Engineering 2011–2015

REFERENCES AVAILABLE TO CONTACT

Prof. Stojan Radic (Postdoc advisor) ECE, UCSD

Email: add4lv@r.postjobfree.com Phone: 858-***-****

Dr. Bill P.-P. Kuo (Postdoc co-advisor) Photonics Systems Group, UCSD Email: add4lv@r.postjobfree.com Phone: 858-***-****

PUBLICATIONS

1. 1. Y. Gao, et al. “High-speed Van der Waals heterostructure tunneling photodiodes integrated on silicon nitride waveguides,” Optica, 6, 514 (2019). 2. 2. Y. Gao, et al. “Silicon nitride waveguide-integrated chemical vapor deposited graphene photodetector with 38 GHz bandwidth,” Nanoscale, 10, 21851 (2018). 3. 3. Y. Gao, et al. “Graphene-on-silicon nitride waveguide photodetector with interdigital contacts,” Applied Physics Letters, 112, 211107 (2018). 4. 4. Y. Gao, et al. “High-performance chemical vapor deposited graphene-on-silicon nitride waveguide photodetectors,” Optics Letters, 43, 1399 (2018). 5. 5. L. Tao, H. Li, Y. Gao, et al. “Deterministic and Etching-Free Transfer of Large-Scale 2D Layered Materials for Constructing Interlayer Coupled van der Waals Heterostructures,” Advanced Materials Technologies, 3, 1700282 (2018). 6. 6. Y. Gao, et al. “Cavity-enhanced thermo-optic bistability and hysteresis in a graphene-on- Si3N4 ring resonator,” Optics Letters, 42, 1950 (2017). 7. Y. Gao, et al. “Asymmetric graphene-on-silicon nitride waveguide photodetector towards fast speed and high responsivity”, in CLEO, CA, May 2019, paper STh3N.3. 8. Y. Gao, et al. “Two-dimensional van der Waals heterostructure tunneling photodiodes on silicon nitride waveguides”, in OFC, San Diego, CA, March 2019, paper Th3B.8. 9. Y. Gao, et al. “Carrier Dynamics and Engineering of High Speed Hybrid Integrated Graphene Photodetectors”, in European Optical Society Biennial Meeting, October 2018. 10. Y. Gao, et al. “30-GHz graphene-on-silicon nitride waveguide photodetector,” in CLEO, May 2018, paper SM2I.7.

11. Y. Gao, et al. “Enhanced Thermo-Optic Bistability in Graphene-on-Silicon Nitride Ring Resonators,” in CLEO, CA, May 2017, paper JW2A.121. 7. 12. W. Zhou, Z. Cheng, Y. Gao, et al. “Fully suspended slot waveguide racetrack resonators,” in 19th European Conference on Integrated Optics (ECIO), M4.4, 2017. HONORS

&

AWARDS

International:

Corning Women in OFC Scholarships for 2019 (one of the three winners); Outstanding Position Paper in National Model United Nations New York Conference (NY, 2015)

National: China National Scholarship (2 times for 2011~2012 and 2012~2013, top 2%). HOBBIES

• I like singing, playing badminton, cycling and hiking. I am learning Climbing recently.

• Participated in the Standard Chartered Hong Kong Marathon (2016);

• Participated in 3000 meters (2012) and 800 meters (2013) on behalf of the EE department at school;

• Won the second prize in school women's badminton singles in EE department (2012).

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