Photonics Engineer

ZIQI ZHAO

R *************@*****.*** Ó +1-513-***-****

Rosemead, CA 91770

Objectives

Job or Research in physics, optics, photonics, semiconductor or electrical and computer engineering related field.

Education

University of Wisconsin-Madison 09/2023-12/2024

Major: Electrical and Computer Engineering — Degree: Master of Engineering Miami University, Oxford 08/2018-05/2023

Major: Physics — Degree: Bachelor of Science

Internship Experience

China Kunlun Contracting and Engineering Corporation (Dalian) 07/2021 Mechanical Engineer Assistant

• Assisted in surveying, mapping, design optimization of the coiled tubing, downhole drilling tools and oil equipment on site.

• Completed oral and written translation between engineering teams from the U.S. and China Zhejiang Tenglong Stainless Steel Rod and Wire Co., Ltd. 07/2020 Electrical Engineer Assistant

• Learned and practiced programmable logic controller (PLC) and human machine interface (HMI) programming based on specific technological requirements

• Grasped how to control servo motors and the constant tension system Research Experience

Microcomputer Control of Electromechanical Systems 07/2022-08/2022 Tutored by Prof. Michael Littman, Princeton University

• Falstad: Simulated second derivative computer for automatic calculation of second-order derivatives from input signals.

• Tinkercad: Programmed and simulated an Arduino microcontroller for various tasks. Academic Projects

Computational Method of Electromagnetism 01/2024-02/2024

• Simulated 2D Finite-Difference Time-Domain with PEC and PML boundary conditions via MAT- LAB.

• Simulated Q-factor and number of grating period trade-off of a SiN and SiO2 grating mirror based laser cavity using Tidy3D.

Solid State and Semiconductors 11/2023-12/2023

• GaNFET & GaN HEMTs Operating modes and features analysis.

• Simulated band structure of Si, GaAs, graphite.

• Monte Carlo simulation of electron scattering mechanisms of intrinsic bulk GaAs.

• TCAD simulation and a mask layout of a semiconductor device. (9/2024-12/2024) Optics 01/2023-05/2023

• Polarizer and QWP Alignment: Determined laser polarization using polarizers; aligned a QWP for circularly polarized light and verified results through power measurements.

• Wave Plates: Aligned half-wave and quarter-wave plates for effective control of laser beam polariza- tion, achieving precise light manipulation.

• Laser Collimation & Polarization: Operated a diode laser to achieve collimation and proper beam alignment; analyzed beam ellipticity and set vertical polarization for spectroscopy.

• ECDL System: Built and calibrated an ECDL with TEC for temperature stability; integrated diffrac- tion gratings for frequency bandwidth narrowing and tuning.

• SAS on Rb: Conducted SAS on Rubidium to achieve Doppler-free spectra, resolved hyperfine struc- tures, and evaluated power broadening impacts on linewidths. Radio Frequency 11/2023-12/2023

• Designed a low noise amplifier for a GPS system, focusing on impedance matching and utilizing Keysight ADS for simulation and optimization.

Electronics 10/2021-12/2021

• Investigated Bi-2223 superconductivity through X-ray diffraction and resistivity tests to determine critical temperature and crystal structure.

• Recorded I-V characteristics of diodes and transistors, analyzed LED ideality factors, and studied transistor behavior in transdiode configuration.

• Verified Newton’s Law of Cooling with a thermistor-based circuit.

• Controlled Feather M0 microcontroller with Python for automated tasks.

• Assembled Schmitt-trigger circuits to measure hysteresis and trigger points.

• Developed a microcontroller-based automatic mailbox and designed an adjustable heater circuit. Contemporary Physics 02/2022-05/2022

• Measured hydrogen spectrum peaks to calculate the Rydberg constant and verify quantum energy transitions.

• Verified discrete energy levels of argon in a Frank-Hertz experiment.

• Analyzed alkali spectra to identify spin-coupling effects in p-orbital transitions.

• Investigated Iodine’s discrete vibrational energy levels using laser-induced fluorescence.

• Conducted photoelectric effect experiments to demonstrate the particle nature of light through stop- ping potential measurements.

Skills

• Professional Skills: MOCVD process, RF (Radio frequency), Thermodynamics, Electromagnetism + Photonics + Optics, Quantum Mechanics, Circuit Design, Semiconductor Fabrication + Solid State Physics, Oscilloscope, Microcontroller

• Computer Skills: Keysight Advanced Design System, MATLAB, LaTeX (Overleaf), Falstad, python, Ocean Optics, Tidy3D, OriginLab, Silvaco Atlas TCAD, Tinkercad, R Studio, Excel, PowerPoint

• Languages: Mandarin (native), English (fluent)

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