Geometry-Controlled Polarization Photocurrents in Scalable PtSe2 Infrared Pixels

@misc{paik2026geometrycontrolled,
  title = {{Geometry-Controlled Polarization Photocurrents in Scalable PtSe2 Infrared Pixels}},
  author = {Eunice Y. Paik and Owen A. Vail and Madaline R. Marland and William A. Beck and Antonio Llopis-Jepsen and Wendy L. Sarney and Jeffery H. Leach and Stefan Heiserer and Nikolas Dominik and Cormac Ó Coileáin and Paul B. Seifert and Georg S. Duesberg and Blair C. Connelly and George J. de Coster},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.32136},
  eprint = {2609.32136},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.32136},
}

TY  - UNPB
TI  - Geometry-Controlled Polarization Photocurrents in Scalable PtSe2 Infrared Pixels
AU  - Eunice Y. Paik
AU  - Owen A. Vail
AU  - Madaline R. Marland
AU  - William A. Beck
AU  - Antonio Llopis-Jepsen
AU  - Wendy L. Sarney
AU  - Jeffery H. Leach
AU  - Stefan Heiserer
AU  - Nikolas Dominik
AU  - Cormac Ó Coileáin
AU  - Paul B. Seifert
AU  - Georg S. Duesberg
AU  - Blair C. Connelly
AU  - George J. de Coster
PY  - 2026
DA  - 2026/09/26
PB  - arXiv
DO  - 10.48550/arxiv.2609.32136
UR  - https://arxiv.org/abs/2609.32136
AB  - Polarization-sensitive photodetectors provide multi-dimensional optical information beyond the capabilities of traditional intensity-based detectors. The noble metal dichalcogenide PtSe2 presents unique opportunities for tunable polarization detection due to its strong spin-orbit coupling, material stability, customizable broadband polarization responses, and direct compatibility with a wide range of substrates for back-end-of-line silicon integration. In this work, we demonstrate room-temperature near-infrared to mid-wavelength infrared polarization photoresponses using scalable, as-grown, wide-area PtSe2 films, and we show that the measured polarization response is reshaped by device geometry. Finite-element current-flow simulations reproduce the observed spatial redistribution of the polarization-sensitive response and localize the transverse polarization response near the pixel center. This geometry-enabled separation allows wavelength-dependent laser spot scans to distinguish symmetry-allowed photocurrents from contact-proximate, dichroism-mediated photothermal contributions. At near-infrared wavelengths, we observe spatial response that is consistent with linear-dichroic photothermoelectric currents, whereas mid-wavelength infrared measurements reveal a helicity-dependent photothermal contribution under oblique illumination. These results identify pixel boundary engineering as both a design lever and a diagnostic tool for scalable PtSe2 polarization-sensitive infrared pixels.
ER  -