Dr. David B. Geohegan Profile

Dr. David B. Geohegan

Distinguished Research Staff at Oak Ridge National Lab

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (25)

Proceedings Article | 11 April 2024 Presentation

Real-time diagnostic-guided precision synthesis of atomically-thin 2D materials by pulsed laser interactions: enabling autonomous discovery

David Geohegan

Proceedings Volume PC12939, PC129390E (2024) https://doi.org/10.1117/12.3008747

KEYWORDS: 2D materials, Laser processing, Scanning transmission electron microscopy, Pulsed laser operation, Laser ablation, Pulsed laser deposition, Heterojunctions, Materials science, Electron microscopy, Electrical properties

Read Abstract +

Proceedings Article | 13 March 2024 Presentation

Synthesis of 2D Janus and heterostructures by hyperthermal PLD implantation with in situ diagnostics

Kai Xiao, Sumner Harris, Yiling Yu, Yu-Chuan Lin, Austin Houston, Jordan Hachtel, Alexander Puretzky, Christopher Rouleau, Mina Yoon, Gerd Duscher, David Geohegan

Proceedings Volume PC12874, PC128740I (2024) https://doi.org/10.1117/12.3005378

KEYWORDS: Crystals, Quantum processing, Quantum conversion, Selenium, Raman spectroscopy, Materials science, Heterojunctions, 2D materials, Vibration, Spectroscopy

Read Abstract +

Proceedings Article | 17 March 2023 Presentation

Combining gas-phase, structural, and optical diagnostics for in situ feedback and control during pulsed laser deposition

Sumner Harris, Christopher Rouleau, Alexander Puretzky, Seok Joon Yun, Liangbo Liang, Ondrej Dyck, Tom Berlijn, Gyula Eres, Gerd Duscher, Austin Houston, Yu-Chuan Lin, Mina Yoon, Kai Xiao, David Geohegan

Proceedings Volume PC12410, PC1241006 (2023) https://doi.org/10.1117/12.2650571

KEYWORDS: Feedback control, Pulsed laser deposition, Optical diagnostics, Beam controllers, Diagnostics, Selenium, Raman spectroscopy, Materials science, Machine learning, Ions

Read Abstract +

Proceedings Article | 8 March 2021 Presentation

In situ characterization of the laser-induced synthesis and photonic properties of nanostructures in a TEM

Chenze Liu, Yu-Chuan Lin, Yiling Yu, Yueying Wu, Alexander Puretzky, Mina Yoon, Gyula Eres, Christopher Rouleau, Philip Rack, Kai Xiao, Gerd Duscher, David Geohegan

Proceedings Volume 11675, 116750D (2021) https://doi.org/10.1117/12.2578719

KEYWORDS: Transmission electron microscopy, Laser crystals, Crystals, Crystallography, Heterojunctions, Spectroscopy, Pulsed laser deposition, Particles, Optical simulations, Materials science

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

Welcome and Introduction to SPIE Conference 11675

David Geohegan, Andrei Kabashin, Jan Dubowski, Maria Farsari

Proceedings Volume 11675, 1167502 (2021) https://doi.org/10.1117/12.2592485

Read Abstract +

Proceedings Article | 5 March 2021 Presentation

In situ diagnostics of photoinduced processing and exciton diffusivity enhancement in two-dimensional semiconductors

Yiling Yu, Yifei Yu, Guoqing Li, Linyou Cao, Alexander Puretzky, Christopher Rouleau, David Geohegan

Proceedings Volume 11675, 116750E (2021) https://doi.org/10.1117/12.2578948

KEYWORDS: Crystals, Second-harmonic generation, Micro raman spectroscopy, Single photon, Magnetism, Excitons, Electron microscopy, Crystallography, Chemical vapor deposition

Read Abstract +