Mr. William M. Humphreys Profile

William M. Humphreys

AST Electronic Engineer at NASA Langley Research Ctr

SPIE Involvement:

Author

Proceedings Article | 13 March 2024 Presentation

Advancing metasurfaces towards new frontiers: nonvolatile reconfigurable optics

Hyun Jung Kim, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Cosmin-Constantin Popescu, Steven Vitale, Hyung Bin Bae, Taewoo Lee, Tian Gu, Juejun Hu

Proceedings Volume PC12896, PC128960D (2024) https://doi.org/10.1117/12.2692087

KEYWORDS: Free space optics, Transmission electron microscopy, Interfaces, Fabrication, Design and modelling, Circuit switching, Adaptive optics, Thermal modeling, Temperature distribution, Spectroscopes

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Proceedings Article | 15 June 2023 Presentation

P-ACTIVE (PCM-based actively tunable filter) project at NASA

Hyun Jung Kim, Stephen Borg, Scott Bartram, William Humphreys, Juejun Hu, Tian Gu, Matthew Julian, Calum Williams

Proceedings Volume PC12514, PC1251403 (2023) https://doi.org/10.1117/12.2655485

KEYWORDS: Tunable filters, Thermal sensing, Space operations, Optical filters, Mid-IR, Lead, Infrared signatures, Image filtering, Chemical species, Biological and chemical sensing

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Proceedings Article | 15 June 2023 Presentation

Dynamic light shaping using active optical metasurfaces

Fan Yang, Cosmin-Constantin Popescu, Carlos Ríos Ocampo, Yifei Zhang, Mikhail Shalaginov, Hung-I Lin, Sensong An, Hyun Jung Kim, Matthew Julian, Calum Williams, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Clara Rivero-Baleine, Paul Miller, Christopher Roberts, Steven Vitale, Hualiang Zhang, Juejun Hu, Tian Gu

Proceedings Volume PC12514, PC125140A (2023) https://doi.org/10.1117/12.2664410

KEYWORDS: Active optics, Optical components, Nanoantennas, Integrated optics

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Proceedings Article | 17 March 2023 Presentation

Phase change reconfigurable optical wavefront synthesis system

Hyun Jung Kim, Kiumars Aryana, Scott Bartram, Stephen Borg, William Humphreys, Cosmin-Constantin Popescu, Tian Gu, Juejun Hu, Steven Vitale

Proceedings Volume PC12432, PC124320N (2023) https://doi.org/10.1117/12.2647764

KEYWORDS: Wavefronts, Silicon, Tunable filters, Switching, Sensors, Remote sensing, Optical fabrication equipment, Optical fabrication, Optical communications, Light scattering

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Proceedings Article | 15 March 2023 Presentation + Paper

Learning from failure: boosting cycling endurance of optical phase change materials

Cosmin-Constantin Popescu, Steven Vitale, Christopher Roberts, Paul Miller, Kiumars Aryana, Myungkoo Kang, Kathleen Richardson, Hyun Jung Kim, William Humphreys, Tian Gu, Juejun Hu

Proceedings Volume 12431, 124310B (2023) https://doi.org/10.1117/12.2657208

KEYWORDS: Photonics, Quantum photonics, Lithium, Switching, Optical switching, Chalcogenides, Silicon, Crystals, Phase shift keying, Transistors

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Proceedings Article | 14 March 2023 Presentation

Effects of LEO space exposure on GeSbTe phase-change metasurface spectral filters (Conference Presentation)

Kiumars Aryana, Hyun Jung Kim, Matthew Julian, Stephen Borg, Scott Bartram, William Humphreys

Proceedings Volume 12417, 1241704 (2023) https://doi.org/10.1117/12.2648484

KEYWORDS: Optical filters, Germanium antimony tellurium, Active optics, Ultraviolet radiation, Oxygen, Optical properties, Optical components, Ionizing radiation, Environmental monitoring, Astronomical imaging

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Proceedings Article | 5 March 2022 Presentation

Phase-change-material (PCM)-based actively tunable filters for both terrestrial and spaceborne platforms

Hyun Jung Kim, Stephen Borg, William Humphreys, Matthew Julian, Calum Williams, David Bombara, Yifei Zhang, Juejun Hu, Tian Gu

Proceedings Volume PC12011, PC1201102 (2022) https://doi.org/10.1117/12.2607826

KEYWORDS: Tunable filters, Phase shift keying, Optical filters, Mid-IR, Solid state electronics, Optical components, Ultraviolet radiation, Ultrafast phenomena, Thin films, Thermography

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Proceedings Article | 12 April 2021 Presentation

Active tunable MWIR filters: phase-change tunable filters for MWIR imaging based on GeSbTe-integrated metasurfaces

Hyun Jung Kim, Matthew Julian, Calum Williams, Stephen Borg, David Bombara, William Humphreys

Proceedings Volume 11723, 1172304 (2021) https://doi.org/10.1117/12.2586511

KEYWORDS: Tunable filters, Mid-IR, Image filtering, Optical filters, Solid state electronics, Refractive index, Plasmonics, Transmittance, Thermography, Thermal sensing

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