--- OA_place: repository OA_type: green _id: '21524' abstract: - lang: eng text: In X-ray tubes, more than 99% of the kilowatts of power supplied to generate X-rays via bremsstrahlung is lost as heat in the anode. Therefore, thermal management is a critical barrier to the development of more powerful X-ray tubes with higher brightness and spatial coherence, which are needed to translate imaging modalities such as phase-contrast imaging to the clinic. In rotating anode X-ray tubes, the most common design, thermal radiation is a bottleneck that prevents efficient cooling of the anode─the hottest part of the device by far. We predict that nanophotonic patterning of the anode of an X-ray tube enhances heat dissipation via thermal radiation, enabling it to operate at higher powers without an increase in temperature. The focal spot size, which is related to the spatial coherence of generated X-rays, can also be reduced at a constant temperature. A major advantage of our “nanophotonic thermal management” approach is that in principle, it allows complete control over the spectrum and direction of thermal radiation, which can lead to optimal thermal routing and improved performance. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Simo full_name: Pajovic, Simo last_name: Pajovic - first_name: Charles full_name: Roques-Carmes, Charles id: e2e68fc9-6505-11ef-a541-eb4e72cc3e82 last_name: Roques-Carmes - first_name: Seou full_name: Choi, Seou last_name: Choi - first_name: Steven E. full_name: Kooi, Steven E. last_name: Kooi - first_name: Rajiv full_name: Gupta, Rajiv last_name: Gupta - first_name: Michael E. full_name: Zalis, Michael E. last_name: Zalis - first_name: Ivan full_name: Čelanović, Ivan last_name: Čelanović - first_name: Marin full_name: Soljačić, Marin last_name: Soljačić citation: ama: Pajovic S, Roques-Carmes C, Choi S, et al. Nanophotonic thermal management in X-ray tubes. ACS Nano. 2025;19(35):31363-31370. doi:10.1021/acsnano.5c05186 apa: Pajovic, S., Roques-Carmes, C., Choi, S., Kooi, S. E., Gupta, R., Zalis, M. E., … Soljačić, M. (2025). Nanophotonic thermal management in X-ray tubes. ACS Nano. American Chemical Society. https://doi.org/10.1021/acsnano.5c05186 chicago: Pajovic, Simo, Charles Roques-Carmes, Seou Choi, Steven E. Kooi, Rajiv Gupta, Michael E. Zalis, Ivan Čelanović, and Marin Soljačić. “Nanophotonic Thermal Management in X-Ray Tubes.” ACS Nano. American Chemical Society, 2025. https://doi.org/10.1021/acsnano.5c05186. ieee: S. Pajovic et al., “Nanophotonic thermal management in X-ray tubes,” ACS Nano, vol. 19, no. 35. American Chemical Society, pp. 31363–31370, 2025. ista: Pajovic S, Roques-Carmes C, Choi S, Kooi SE, Gupta R, Zalis ME, Čelanović I, Soljačić M. 2025. Nanophotonic thermal management in X-ray tubes. ACS Nano. 19(35), 31363–31370. mla: Pajovic, Simo, et al. “Nanophotonic Thermal Management in X-Ray Tubes.” ACS Nano, vol. 19, no. 35, American Chemical Society, 2025, pp. 31363–70, doi:10.1021/acsnano.5c05186. short: S. Pajovic, C. Roques-Carmes, S. Choi, S.E. Kooi, R. Gupta, M.E. Zalis, I. Čelanović, M. Soljačić, ACS Nano 19 (2025) 31363–31370. date_created: 2026-03-30T12:22:47Z date_published: 2025-08-26T00:00:00Z date_updated: 2026-04-27T08:56:39Z day: '26' doi: 10.1021/acsnano.5c05186 extern: '1' external_id: arxiv: - '2503.20946' intvolume: ' 19' issue: '35' keyword: - X-ray tubes - thermal management - nanophotonics - thermal radiation - X-ray imaging - high-temperature language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2503.20946 month: '08' oa: 1 oa_version: Preprint page: 31363-31370 publication: ACS Nano publication_identifier: eissn: - 1936-086X issn: - 1936-0851 publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: Nanophotonic thermal management in X-ray tubes type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 19 year: '2025' ... --- OA_type: closed access _id: '21530' abstract: - lang: eng text: Metasurfaces, ultrathin structures composed of subwavelength optical elements, have revolutionized light manipulation by enabling precise control over electromagnetic waves’ amplitude, phase, polarization, and spectral properties. Concurrently, computational imaging leverages algorithms to reconstruct images from optically processed signals, overcoming the limitations of traditional imaging systems. This Perspective explores the synergistic integration of metaoptics and computational imaging, “metaoptic computational imaging”, which combines the physical wavefront shaping ability of metasurfaces with advanced computational algorithms to enhance imaging performance beyond conventional limits. We discuss how metaoptic computational imaging addresses the inherent limitations of single-layer metasurfaces in achieving multifunctionality without compromising efficiency. By treating metasurfaces as physical preconditioners and codesigning them with reconstruction algorithms through end-to-end (inverse) design, it is possible to jointly optimize the optical hardware and computational software. Advanced applications and new frontiers in the field enabled by metaoptic computational imaging are highlighted, including phase imaging and quantum state measurement. article_processing_charge: No article_type: original author: - first_name: Charles full_name: Roques-Carmes, Charles id: e2e68fc9-6505-11ef-a541-eb4e72cc3e82 last_name: Roques-Carmes - first_name: Kai full_name: Wang, Kai last_name: Wang - first_name: Yuanmu full_name: Yang, Yuanmu last_name: Yang - first_name: Arka full_name: Majumdar, Arka last_name: Majumdar - first_name: Zin full_name: Lin, Zin last_name: Lin citation: ama: Roques-Carmes C, Wang K, Yang Y, Majumdar A, Lin Z. Metaoptic computational imaging. ACS Photonics. 2025;12(4):1722-1733. doi:10.1021/acsphotonics.4c02266 apa: Roques-Carmes, C., Wang, K., Yang, Y., Majumdar, A., & Lin, Z. (2025). Metaoptic computational imaging. ACS Photonics. American Chemical Society. https://doi.org/10.1021/acsphotonics.4c02266 chicago: Roques-Carmes, Charles, Kai Wang, Yuanmu Yang, Arka Majumdar, and Zin Lin. “Metaoptic Computational Imaging.” ACS Photonics. American Chemical Society, 2025. https://doi.org/10.1021/acsphotonics.4c02266. ieee: C. Roques-Carmes, K. Wang, Y. Yang, A. Majumdar, and Z. Lin, “Metaoptic computational imaging,” ACS Photonics, vol. 12, no. 4. American Chemical Society, pp. 1722–1733, 2025. ista: Roques-Carmes C, Wang K, Yang Y, Majumdar A, Lin Z. 2025. Metaoptic computational imaging. ACS Photonics. 12(4), 1722–1733. mla: Roques-Carmes, Charles, et al. “Metaoptic Computational Imaging.” ACS Photonics, vol. 12, no. 4, American Chemical Society, 2025, pp. 1722–33, doi:10.1021/acsphotonics.4c02266. short: C. Roques-Carmes, K. Wang, Y. Yang, A. Majumdar, Z. Lin, ACS Photonics 12 (2025) 1722–1733. date_created: 2026-03-30T12:22:47Z date_published: 2025-02-13T00:00:00Z date_updated: 2026-04-27T07:12:34Z day: '13' doi: 10.1021/acsphotonics.4c02266 extern: '1' intvolume: ' 12' issue: '4' keyword: - nanophotonics - metasurfaces - computational imaging - inverse design language: - iso: eng month: '02' oa_version: None page: 1722-1733 publication: ACS Photonics publication_identifier: eissn: - 2330-4022 publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: Metaoptic computational imaging type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 12 year: '2025' ... --- OA_place: publisher OA_type: green _id: '21572' abstract: - lang: eng text: This study focuses on advancing metascintillators to break the 100 ps barrier and approach the 10 ps target. We exploitnanophotonic features, specifically the Purcell effect, to shape and enhance the scintillation properties of the first-generation metascintillator. We demonstrate that a faster emission is achievable along with a more efficient conversionefficiency. This results in a coincidence time resolution improved by a factor of 1.3, crucial for TOF-PET applications. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: A. full_name: Shultzman, A. last_name: Shultzman - first_name: R. full_name: Schütz, R. last_name: Schütz - first_name: Y. full_name: Kurman, Y. last_name: Kurman - first_name: N. full_name: Lahav, N. last_name: Lahav - first_name: G. full_name: Dosovitskiy, G. last_name: Dosovitskiy - first_name: Charles full_name: Roques-Carmes, Charles id: e2e68fc9-6505-11ef-a541-eb4e72cc3e82 last_name: Roques-Carmes - first_name: Y. full_name: Bekenstein, Y. last_name: Bekenstein - first_name: G. full_name: Konstantinou, G. last_name: Konstantinou - first_name: R. full_name: Latella, R. last_name: Latella - first_name: L. full_name: Zhang, L. last_name: Zhang - first_name: F. full_name: Loignon-Houle, F. last_name: Loignon-Houle - first_name: A. J. full_name: Gonzalez, A. J. last_name: Gonzalez - first_name: J. M. full_name: Benlloch, J. M. last_name: Benlloch - first_name: I. full_name: Kaminer, I. last_name: Kaminer - first_name: P. full_name: Lecoq, P. last_name: Lecoq citation: ama: Shultzman A, Schütz R, Kurman Y, et al. Toward a second generation of metascintillators using the Purcell effect. IEEE Transactions on Radiation and Plasma Medical Sciences. 2025;9(2):141-147. doi:10.1109/trpms.2024.3471251 apa: Shultzman, A., Schütz, R., Kurman, Y., Lahav, N., Dosovitskiy, G., Roques-Carmes, C., … Lecoq, P. (2025). Toward a second generation of metascintillators using the Purcell effect. IEEE Transactions on Radiation and Plasma Medical Sciences. Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/trpms.2024.3471251 chicago: Shultzman, A., R. Schütz, Y. Kurman, N. Lahav, G. Dosovitskiy, Charles Roques-Carmes, Y. Bekenstein, et al. “Toward a Second Generation of Metascintillators Using the Purcell Effect.” IEEE Transactions on Radiation and Plasma Medical Sciences. Institute of Electrical and Electronics Engineers, 2025. https://doi.org/10.1109/trpms.2024.3471251. ieee: A. Shultzman et al., “Toward a second generation of metascintillators using the Purcell effect,” IEEE Transactions on Radiation and Plasma Medical Sciences, vol. 9, no. 2. Institute of Electrical and Electronics Engineers, pp. 141–147, 2025. ista: Shultzman A, Schütz R, Kurman Y, Lahav N, Dosovitskiy G, Roques-Carmes C, Bekenstein Y, Konstantinou G, Latella R, Zhang L, Loignon-Houle F, Gonzalez AJ, Benlloch JM, Kaminer I, Lecoq P. 2025. Toward a second generation of metascintillators using the Purcell effect. IEEE Transactions on Radiation and Plasma Medical Sciences. 9(2), 141–147. mla: Shultzman, A., et al. “Toward a Second Generation of Metascintillators Using the Purcell Effect.” IEEE Transactions on Radiation and Plasma Medical Sciences, vol. 9, no. 2, Institute of Electrical and Electronics Engineers, 2025, pp. 141–47, doi:10.1109/trpms.2024.3471251. short: A. Shultzman, R. Schütz, Y. Kurman, N. Lahav, G. Dosovitskiy, C. Roques-Carmes, Y. Bekenstein, G. Konstantinou, R. Latella, L. Zhang, F. Loignon-Houle, A.J. Gonzalez, J.M. Benlloch, I. Kaminer, P. Lecoq, IEEE Transactions on Radiation and Plasma Medical Sciences 9 (2025) 141–147. date_created: 2026-03-30T12:22:47Z date_published: 2025-02-01T00:00:00Z date_updated: 2026-04-27T10:44:57Z day: '01' ddc: - '530' doi: 10.1109/trpms.2024.3471251 extern: '1' external_id: arxiv: - '2406.15058' intvolume: ' 9' issue: '2' keyword: - Nanophotonics - Positron emission tomography - scintillators language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2406.15058 month: '02' oa: 1 oa_version: Preprint page: 141-147 publication: IEEE Transactions on Radiation and Plasma Medical Sciences publication_identifier: eissn: - 2469-7303 issn: - '2469-7311 ' publication_status: published publisher: Institute of Electrical and Electronics Engineers quality_controlled: '1' scopus_import: '1' status: public title: Toward a second generation of metascintillators using the Purcell effect type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 9 year: '2025' ... --- OA_place: repository OA_type: green _id: '21533' abstract: - lang: eng text: Recent advances in the fabrication of nanostructures and nanoscale features in metasurfaces offer new prospects for generating visible light emission from low-energy electrons. Here we present the experimental observation of visible light emission from low-energy free electrons interacting with nanoscale periodic surfaces through the Smith–Purcell (SP) effect. We demonstrate SP light emission from nanoscale gratings with periodicity as small as 50 nm, enabling the observation of tunable visible radiation from low-energy electrons (1.5 to 6 keV), an order of magnitude lower in energy than previously reported. We study the emission wavelength and intensity dependence on the grating pitch and electron energy, showing agreement between experiment and theory. Our results open the way to the production of SP-based nanophotonics integrated devices. Built inside electron microscopes, SP sources could enable the development of novel electron–optical correlated spectroscopic techniques and facilitate the observation of new quantum effects in light sources. article_processing_charge: No article_type: letter_note arxiv: 1 author: - first_name: Aviram full_name: Massuda, Aviram last_name: Massuda - first_name: Charles full_name: Roques-Carmes, Charles id: e2e68fc9-6505-11ef-a541-eb4e72cc3e82 last_name: Roques-Carmes - first_name: Yujia full_name: Yang, Yujia last_name: Yang - first_name: Steven E. full_name: Kooi, Steven E. last_name: Kooi - first_name: Yi full_name: Yang, Yi last_name: Yang - first_name: Chitraang full_name: Murdia, Chitraang last_name: Murdia - first_name: Karl K. full_name: Berggren, Karl K. last_name: Berggren - first_name: Ido full_name: Kaminer, Ido last_name: Kaminer - first_name: Marin full_name: Soljačić, Marin last_name: Soljačić citation: ama: Massuda A, Roques-Carmes C, Yang Y, et al. Smith–Purcell radiation from low-energy electrons. ACS Photonics. 2018;5(9):3513-3518. doi:10.1021/acsphotonics.8b00743 apa: Massuda, A., Roques-Carmes, C., Yang, Y., Kooi, S. E., Yang, Y., Murdia, C., … Soljačić, M. (2018). Smith–Purcell radiation from low-energy electrons. ACS Photonics. American Chemical Society . https://doi.org/10.1021/acsphotonics.8b00743 chicago: Massuda, Aviram, Charles Roques-Carmes, Yujia Yang, Steven E. Kooi, Yi Yang, Chitraang Murdia, Karl K. Berggren, Ido Kaminer, and Marin Soljačić. “Smith–Purcell Radiation from Low-Energy Electrons.” ACS Photonics. American Chemical Society , 2018. https://doi.org/10.1021/acsphotonics.8b00743. ieee: A. Massuda et al., “Smith–Purcell radiation from low-energy electrons,” ACS Photonics, vol. 5, no. 9. American Chemical Society , pp. 3513–3518, 2018. ista: Massuda A, Roques-Carmes C, Yang Y, Kooi SE, Yang Y, Murdia C, Berggren KK, Kaminer I, Soljačić M. 2018. Smith–Purcell radiation from low-energy electrons. ACS Photonics. 5(9), 3513–3518. mla: Massuda, Aviram, et al. “Smith–Purcell Radiation from Low-Energy Electrons.” ACS Photonics, vol. 5, no. 9, American Chemical Society , 2018, pp. 3513–18, doi:10.1021/acsphotonics.8b00743. short: A. Massuda, C. Roques-Carmes, Y. Yang, S.E. Kooi, Y. Yang, C. Murdia, K.K. Berggren, I. Kaminer, M. Soljačić, ACS Photonics 5 (2018) 3513–3518. date_created: 2026-03-30T12:22:47Z date_published: 2018-08-30T00:00:00Z date_updated: 2026-04-15T11:48:45Z day: '30' ddc: - '530' doi: 10.1021/acsphotonics.8b00743 extern: '1' external_id: arxiv: - '1710.05358' intvolume: ' 5' issue: '9' keyword: - light−matter interactions - periodic structures - nanophotonics - free-electron light sources language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.1710.05358 month: '08' oa: 1 oa_version: Preprint page: 3513-3518 publication: ACS Photonics publication_identifier: eissn: - 2330-4022 publication_status: published publisher: 'American Chemical Society ' quality_controlled: '1' scopus_import: '1' status: public title: Smith–Purcell radiation from low-energy electrons type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 5 year: '2018' ...