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您的检索式：作者名="Adam Overvig"
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| 1 | Wavefront-selective Fano resonant metasurfaces显示文摘Fano resonances are conventionally understood as sharp spectral features with selectivity in the momentum-frequency domain,implying that they can be excited only by plane waves with specific frequencies and incident angles.We demonstrate that Fano resonances can be made generally selective in the spacefrequency domain.They can be tailored to resonate only when excited by a frequency,polarization,and wavefront of choice.This generalization reveals that Fano systems are characterized by eigenwaves that scatter to their time-reversed image upon reflection.Although in conventional Fano systems this trivially occurs for normally incident plane waves,we show that,in general,the selected wavefront is locally retroreflected everywhere across the device.These results show that conventional Fano resonances are a subset of a broader dichroic phenomenon with spin,spatial,and spectral selectivity.We demonstrate these concepts with nonlocal metasurfaces whose governing principles are deeply rooted in the symmetry features of quasi-bound states in the continuum.Enhanced light–matter interactions and symmetry-protection make these phenomena uniquely suited for enriching applications in quantum optics,non-linear optics,augmented reality,and secure optical communications,laying the groundwork for a range of novel compact optical sources and devices. | Adam Overvig Andrea Alù | 2021 | Advanced Photonics2021，3，2： | 3 |
| 2 | Spatio-temporal coupled mode theory for nonlocal metasurfaces显示文摘Diffractive nonlocal metasurfaces have recently opened a broad range of exciting developments in nanophotonics research and applications,leveraging spatially extended—yet locally patterned—resonant modes to control light with new degrees of freedom.While conventional grating responses are elegantly captured by temporal coupled mode theory,current approaches are not well equipped to capture the arbitrary spatial response observed in the nascent field of nonlocal metasurfaces.Here,we introduce spatio-temporal coupled mode theory(STCMT),capable of elegantly capturing the key features of the resonant response of wavefront-shaping nonlocal metasurfaces.This framework can quantitatively guide nonlocal metasurface design while maintaining compatibility with local metasurface frameworks,making it a powerful tool to rationally design and optimize a broad class of ultrathin optical components.We validate this STCMT framework against full-wave simulations of various nonlocal metasurfaces,demonstrating that this tool offers a powerful semi-analytical framework to understand and model the physics and functionality of these devices,without the need for computationally intense full-wave simulations.We also discuss how this model may shed physical insights into nonlocal phenomena in photonics and the functionality of the resulting devices.As a relevant example,we showcase STCMT’s flexibility by applying it to study and rapidly prototype nonlocal metasurfaces that spatially shape thermal emission. | Adam Overvig Sander A.Mann Andrea Alù | 2024 | Light(Science & Applications)2024，13，2： | 0 |
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