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Electrical engineering, optics

Perris, California, United States
May 31, 2019

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Qiushi Liu 951-***-****

Dear Recruiting Manager,

I would like to write this letter to express my strong interest in joining your Group. I have graduated from the University of California, Riverside with a Ph.D. degree in Electrical and Computer Engineering. My supervisor is Prof. Ming Liu whose research fields include Optics and Optoelectronics. It is my great honor to take the opportunity to introduce myself and apply for the opening positions in your team. During my academic career, I have worked as various roles in building up the laboratories, leading my own projects and collaborating with other researchers in several different fields. With 6 years’ research experience, I have obtained a strong foundation in the field of the Imaging, Polarization Optics, Opto-Electronic, and many other Optics-related fields. Due to my inter-discipline background, I also have adequate knowledge in Coding, Data Analysis, Circuit Design, Image processing, and EM Numerical Simulation, etc. I believe I am a strong candidate for the opening position as I have qualifications and experience you are seeking.

The position requirements closely match with my background and skills. A few of my additional attributes I would like to highlight are:

More than 5 years’ experience in designing and maturing Near-field Optical Imaging System from proof of early concepts to the low volume prototype. The imaging projects include 5 parts: Simulation, Optic, Electro-Optic, Control, and Analysis.

Simulation: The COMSOL Electromagnetic Numerical Modeling demonstrated a strong Light-Matter Interaction between Near-field light and Nanostructure (2D devices). Therefore a Near-field Imaging prototype utilizing a scanning-optical probe was built to generate a high-resolution photon-induced signal.

Optic: The prototype used a Nanofocusing Waveguide System to confine visible light into nanoscale and generate photon-induced in-plane electrical signals on 2D devices. A Polarization Calibrating and Maintaining System was built to control the waveguide coupling modes. Both the Real-space and the Momentum-space Microscopy had been built to study the tip modes.

Electro-Optic: Two-dimensional heterostructure devices (2D Optical Sensor) have been built to transform the light signal into the modulated signals. Several stages of circuits (Trans-impedance Amplifier, Bandpass Filter, Schmitt Trigger, Phase Shifter), designed on PSpice, were built to demodulate the signals. The synchronized signals were locked by Lock-in Amplifier for high-harmonic coherent measurement.

Control: A scanning piezo-stage with high accuracy was controlled by the LabVIEW to process sample morphology raster scanning and Signal Mapping simultaneously. Multi-ends equipment (voltage bias) was controlled by the LabVIEW (GPIB equipment) to perform automatic optoelectrical signal acquisition.

Analysis: The demodulated signals were recovered and analyzed using the Matlab. A feature recognition algorithm was developed to correlate the optical signals with the sample morphology.

Have a deep understanding of Optical knowledge including Imaging, Illumination, Characterization, Geometrical Optics, Polarization Optics, Waveguiding Optics, Birefringent Optics, Diffraction Optics, Optical Materials, Thin Film Optics, Optical Sensor (Photodiode), and Semiconductor Optics.

Expert in designing and manufacturing various types of Optoelectronic Components/Systems. Familiar with Lens Testing and Characterization and Optical Instrumentation (Light Source, Power Meters, Optical Spectrum Analyzers, Photodetectors, Oscilloscopes, Optical Components, Optical Modulator, Cameras Calibration, etc.).

Familiar with hands-on laboratory work in setting up/troubleshooting of the optical measurement systems and

(Laser Alignment, Spectroscopy Calibration).

Experience using LabVIEW, Matlab, C++ for Lab Instrument Automation (HW/SW Interaction), Data Collection. Experience using Matlab for Image Processing and Data Analysis.

Expert in board level Circuit Designing, Soldering, and Debugging.

Excellent interpersonal and communication skill. Have experience about cross-group and cross-culture collaboration. Familiar with lab management and laser safety protocols. In charge of the lab management for 2 years and contact with vendors for daily optical component/system construction.

Long-term interested in developing the next-generation optical system, and creative aptitude to learn new related knowledge and technologies.

Please find my resume for a more detailed description of my qualifications and background attached. Should you have any questions or additional materials were required, please feel free to contact me at 951-***-**** or I’m very looking forward to hearing back from you. Thank you very much for your time and consideration! Sincerely,

Qiushi Liu


Qiushi Liu 951-***-**** Ph.D. Degree Department of Electrical and Computer Engineering, University of California, Riverside Supervisor: Professor Ming Liu GPA 3.91/4.00 Sep.2014- Dec. 2018 Bachelor’s Degree Department of Electronic Engineering, The Chinese University of Hong Kong Sep.2009- Jan. 2014

Optics: Near-field Optical Imaging, Raman Characterization, Illumination, Fourier Optics, Fiber Optics, Fiber Polarization, Physical Optics.

Software: Matlab, LabVIEW, Comsol (Optical, Electrical, and Thermal Simulation Modules), SolidWorks, AutoCAD, Zemax, C++, Cadence (PSpice), 3D Max, Photoshop, Microsoft Office.

Electrics: Analog/Digital Circuit Design and Analysis, Circuit Soldering and Debug, Instrumentation and Electrical Measurements, Transmission Lines Fundamentals.

Nano Fabrication: Atomic Layer Deposition (ALD), Electron Beam Lithography (EBL), Focused Ion beam Lithography (FIB), Photolithography, Electron-Beam Evaporator, Thermal Evaporator, Sputtering.

2D Materials Preparation: Chemical Vapor Deposition (CVD), Mechanical Exfoliation.

Characterization: Scanning Tunneling Microscope (STM), Atomic Force Microscope (AFM), Near- Field Scanning Optical Microscope (NSOM), Raman Spectroscopy, Scanning Electron Microscope

(SEM), Transmission Electron Microscopy (TEM).

Physics: Quantum Physics, Solid State Physics, Electrodynamics. Google Scholar:


First author:

1. Qiushi Liu, et al, Nature Communications. (Submitted) 2. Qiushi Liu, et al, Optics Express. (Submitted)

3. Qiushi Liu, et al, Nanoscale, 11 (19), 7790-7797. 4. Qiushi Liu, Ming Liu, Nature Photonics, 10 (17), 614. Co-author:

5. Xuezhi Ma, et al, Nature Nanotechnology. (Submitted) 6. Sanggon Kim, et al. Nature Photonics (Just accepted) 7. Xuezhi Ma, et al, Nano Letters, 17(11), 6961-6967. 8. Xuezhi Ma, et al, Nano Letters, 11(16), 6896-6902. 9. Xuezhi Ma, et al, Nano Letters, 1(19), 100–107. Education

Research Skill

Research Publications



1. Qiushi Liu, et al, 2018 MRS Spring Meeting & Exhibit, April 2018. 2. Xuezhi Ma, Qiushi Liu, et al, 2018 MRS Spring Meeting & Exhibit, April 2018. 3. Xuezhi Ma, Qiushi Liu, et al, APS March Meeting 2018, March 2018. Graduate Research Assistant University of California, Riverside Sep. 2014~ Apr.2019

High-Resolution Near-field Scanning Optical Imaging System

Developing the UV-Visible-NIR range Multistep Nanofocusing System to study the sub-nanoscale Light-Matter Interaction. For the first time, mapped the nanoscale Chemical-Bond / Bandstructure information with ultra-high (~5 nm) spatial resolution.

Silver-based Scanning Probe Microscopy (SPM) for Tip-Enhanced Raman Spectroscopy (TERS)

Built and calibrated SPM-based (AFM, STM) scanning probe system with a side illumination & collection structure to achieve high spatial resolution. Improved the Tip-Enhancement factor via controlling tip shape, protruding length, and surfactant.

The Electromagnetic Modeling and Analysis

Used COMSOL to numerically simulate and optimize the performance of plasmonic nanoscale structures and anisotropic materials (graphene, MoS2). Performance includes Mode Volume, Mode Coupling Efficiency, Field Enhancement Factor and Modulation Depth.

Two-dimensional Materials Growing and Transferring

Obtained the single-layer 2D materials (Graphene, MoS2) using the Chemical Vapor Deposition

(CVD) or mechanical exfoliation method. Used the capillary-force-assisted clean-stamp transfer method to build 2D nanostructure devices layer by layer.

Silver-based Transparent and Conductive Optical Thin Film

Silver-nanomaterials based transparent optical thin film was manufactured with high electrical conductivity to replace transparent electrodes (ITO). Research Assistant The Chinese University of Hong Kong Sep. 2012~ Jul. 2014

Study the Electron Mobility and Photoresponsivity of the Two-dimensional Materials.

Improved the CVD grown 2D materials mobility with high-k gate oxide materials. Examed the devices IV curve and photoresponse.

Research Experience


Ming Liu Email:

Assistant Professor, Electrical and Computer Engineering Suite 321 Winston Chung Hall

University of California, Riverside

Ruoxue Yan Email:

Assistant Professor, Chemical and Environmental Engineering Bourns Hall A247

University of California, Riverside

Jianlin Liu Email:

Professor, Electrical and Computer Engineering

Suite 439 Winston Chung Hall

University of California, Riverside


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