Ph.D. Candidate · High Energy & Semiconductor Physics

Iakovos Tzoka

Building the next generation of photon detectors at the intersection of thin film physics, cleanroom microfabrication, and particle physics instrumentation.

Explore My Research

Probing the Frontier of Detection

I am a Ph.D. candidate in High Energy Physics at the University of Texas at Arlington, working at the crossroads of high-energy particle physics and semiconductor device engineering. My work focuses on designing and fabricating novel photodetectors — from amorphous selenium-based VUV detectors for liquid noble experiments to surface plasmon-enhanced ZnO thin-film devices for cryogenic photon detection.

With extensive cleanroom experience spanning sputtering, e-beam evaporation, photolithography, and plasma etching, I bring an end-to-end capability from simulation (COMSOL Multiphysics) to device characterization (SEM, XRD, FTIR, PL, SPV) — bridging the gap between theoretical design and fabricated reality.

0 Publications
0 Research Projects
0 Conferences
0 Degrees Earned

Academic Trajectory

Aug 2022 — Present

Ph.D. in Applied Physics

University of Texas at Arlington, USA · Expected May 2027

Aug 2022 — May 2025

M.Sc. in Applied Physics

University of Texas at Arlington, USA

Aug 2018 — Mar 2022

B.Sc. in Physics

Texas Christian University, USA

Aug 2016 — Mar 2018

International Baccalaureate

Pinewood American International School, Greece

Experimental Programs

Amorphous Selenium VUV Photodetectors

Designed and fabricated full photodetectors from silicon wafers, exploring vertical and lateral device geometries for liquid argon detection. Integrated trivial transfer graphene as a novel transparent electrode for cryogenic application.

a-Se Cryogenic VUV Liquid Argon

Accelerated Aging of LAPPD Photodetectors

Developed a novel pixel-based accelerated aging methodology to evaluate lifetime of Large Area Picosecond Photodetectors (LAPPDs) from Incom Inc. Identified pixel degradation trends and aging mechanisms through localized illumination tests.

LAPPD MCP-PMT Aging Studies

Surface Plasmon-Enhanced ZnO Detectors

Designed noble-metal/ZnO thin film devices for cryogenic photon detection. Used COMSOL Multiphysics to optimize film thickness and simulate piezoelectric and plasmonic behavior. Built and optimized experimental setups including laser alignment and four-point probe stations.

ZnO Plasmonics COMSOL Piezo-Photonic

ZnO Nanomaterial Studies & Device Engineering

Synthesized hydrothermal ZnO micro/nanocrystals for optoelectronic and antibacterial applications. Developed characterization pipelines using LT-PL, FTIR, EDX, Auger, and SEM. Conducted UHV surface photovoltage studies under varying environmental conditions.

ZnO Nanocrystals Hydrothermal SEM/FTIR

Selected Works

Instrumentation & Toolbox

Deposition

Thermal Evaporation RF Sputtering DC Sputtering E-Beam Evaporation

Microfabrication

Photolithography Spin Coating Wet Etching Plasma Ashing Reactive Ion Etching Lift-off

Characterization

SEM EDS XRD FTIR Photoluminescence SPV Raman UV-Vis-IR Confocal Microscopy I-V/C-V Probe

Programming

Python C++ Java HTML/CSS LaTeX

Simulation & Design

COMSOL Multiphysics OriginLab KiCAD Fusion 360

Materials

a-Se ZnO Ag / Au / Ti / Cr SiO₂ / Si₃N₄ Graphene

Presentations

2026

Probing Local Structure Evolution in Amorphous Selenium via Temperature-Dependent EXAFS

March APS Global Summit 2026, Denver, Colorado

2025

Is lamination the key to large-area, uniform multi-well amorphous Selenium detectors?

Coordinating Panel of Advanced Detectors 2025, UPenn in Philladelphia, Pennsylvania

2024

Vertically Stacked a-Se Based VUV Photodetectors

International Conference on High Energy Physics (ICHEP), Prague, Czech Republic

2023

Recent Results from Pixel-Based Accelerated Aging of LAPPD

Coordinating Panel of Advanced Detectors 2023, Stanford Linear Accelerator Center (SLAC), Menlo Park, CA

Get in Touch

Interested in collaboration, have questions about my research, or looking for a driven experimentalist? I'd be happy to connect.