@article{21524,
  abstract     = {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.},
  author       = {Pajovic, Simo and Roques-Carmes, Charles and Choi, Seou and Kooi, Steven E. and Gupta, Rajiv and Zalis, Michael E. and Čelanović, Ivan and Soljačić, Marin},
  issn         = {1936-086X},
  journal      = {ACS Nano},
  keywords     = {X-ray tubes, thermal management, nanophotonics, thermal radiation, X-ray imaging, high-temperature},
  number       = {35},
  pages        = {31363--31370},
  publisher    = {American Chemical Society},
  title        = {{Nanophotonic thermal management in X-ray tubes}},
  doi          = {10.1021/acsnano.5c05186},
  volume       = {19},
  year         = {2025},
}

@article{21530,
  abstract     = {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.},
  author       = {Roques-Carmes, Charles and Wang, Kai and Yang, Yuanmu and Majumdar, Arka and Lin, Zin},
  issn         = {2330-4022},
  journal      = {ACS Photonics},
  keywords     = {nanophotonics, metasurfaces, computational imaging, inverse design},
  number       = {4},
  pages        = {1722--1733},
  publisher    = {American Chemical Society},
  title        = {{Metaoptic computational imaging}},
  doi          = {10.1021/acsphotonics.4c02266},
  volume       = {12},
  year         = {2025},
}

@article{21572,
  abstract     = {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.},
  author       = {Shultzman, A. and Schütz, R. and Kurman, Y. and Lahav, N. and Dosovitskiy, G. and Roques-Carmes, Charles and Bekenstein, Y. and Konstantinou, G. and Latella, R. and Zhang, L. and Loignon-Houle, F. and Gonzalez, A. J. and Benlloch, J. M. and Kaminer, I. and Lecoq, P.},
  issn         = {2469-7303},
  journal      = {IEEE Transactions on Radiation and Plasma Medical Sciences},
  keywords     = {Nanophotonics, Positron emission tomography, scintillators},
  number       = {2},
  pages        = {141--147},
  publisher    = {Institute of Electrical and Electronics Engineers},
  title        = {{Toward a second generation of metascintillators using the Purcell effect}},
  doi          = {10.1109/trpms.2024.3471251},
  volume       = {9},
  year         = {2025},
}

@article{21533,
  abstract     = {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.},
  author       = {Massuda, Aviram and Roques-Carmes, Charles and Yang, Yujia and Kooi, Steven E. and Yang, Yi and Murdia, Chitraang and Berggren, Karl K. and Kaminer, Ido and Soljačić, Marin},
  issn         = {2330-4022},
  journal      = {ACS Photonics},
  keywords     = {light−matter interactions, periodic structures, nanophotonics, free-electron light sources},
  number       = {9},
  pages        = {3513--3518},
  publisher    = {American Chemical Society },
  title        = {{Smith–Purcell radiation from low-energy electrons}},
  doi          = {10.1021/acsphotonics.8b00743},
  volume       = {5},
  year         = {2018},
}