Thermal Metasurfaces: Complete Emission Control by Combining Local and Nonlocal Light-Matter Interactions

Overvig, Adam; Mann, Sander A.; Alù, Andrea

doi:10.1103/physrevx.11.021050

Cited by 63 publications

(65 citation statements)

References 78 publications

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“…We note that this type of "full" analysis, to the best of our knowledge, has not been performed to explain scintillation (nor incoherent cathodoluminescence) experiments, likely because of the prohibitively expensive computa-tions associated with simulating ensembles of dipoles radiating in 3D structures. The reciprocity framework we use [also commonly used in areas of thermal radiation, LEDs, and photoluminescence (34,(50)(51)(52)(53)(54)] strongly simplifies the analysis, and makes a full modeling of the scintillation problem tractable. We conclude by outlining a few promising avenues of future work that are enabled by the results provided here.…”

Section: Discussionmentioning

confidence: 99%

A framework for scintillation in nanophotonics

Roques‐Carmes

Rivera

Ghorashi

et al. 2022

Science

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Bombardment of materials by high-energy particles often leads to light emission in a process known as scintillation. Scintillation has widespread applications in medical imaging, x-ray nondestructive inspection, electron microscopy, and high-energy particle detectors. Most research focuses on finding materials with brighter, faster, and more controlled scintillation. We developed a unified theory of nanophotonic scintillators that accounts for the key aspects of scintillation: energy loss by high-energy particles, and light emission by non-equilibrium electrons in nanostructured optical systems. We then devised an approach based on integrating nanophotonic structures into scintillators to enhance their emission, obtaining nearly an order-of-magnitude enhancement in both electron-induced and x-ray–induced scintillation. Our framework should enable the development of a new class of brighter, faster, and higher-resolution scintillators with tailored and optimized performance.

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Section: Discussionmentioning

confidence: 99%

A framework for scintillation in nanophotonics

Roques‐Carmes

Rivera

Ghorashi

et al. 2022

Science

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show abstract

“…To achieve an angle-dependent phase shift with a single metasurface, it would instead be necessary to design angle-dependent meta-atoms providing different phase shifts for different angles [35] or, more broadly, "nonlocal metasurfaces" with an overall angle-dependent response [36][37][38][39][40][41][42][43]. As further discussed in the Discussion section, nonlocal metasurfaces may provide some intriguing opportunities to overcome the limitations discussed in the following, which are based on the assumption of local interactions between incident wave and meta-atoms.…”

Section: Resultsmentioning

confidence: 99%

“…For this reason, achromatic diffractive lenses, unlike dispersion-engineered metalenses, are not limited by delay-bandwidth considerations, but suffer from other limitations especially in terms of focusing power [4]. This general discussion also hints at the large potential of nonlocal metasurfaces [36][37][38][39][40][41][42][43] -an emerging class of metasurfaces specifically designed to exhibit strong nonlocal effects -to potentially achieve performance metrics that are unattainable with more conventional designs.…”

Section: Discussionmentioning

confidence: 96%

Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses

Shastri¹,

Monticone²

2022

Preprint

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Optical systems with wide field-of-views (FOV) are crucial for many applications such as high performance imaging, optical projection, augmented/virtual reality, and miniaturized medical imaging tools. Typically, aberration-free imaging with a wide FOV is achieved by stacking multiple refractive lenses (as in a "fisheye" lens), adding to the size and weight of the optical system. Single metalenses designed to have a wide FOV have the potential to replace these bulky imaging systems and, moreover, they may be dispersion engineered for spectrally broadband operation. In this paper, we derive a fundamental bound on the spectral bandwidth of dispersion-engineered wide-FOV achromatic metalenses. We show that for metalenses with a relatively large numerical aperture (NA), there is a tradeoff between the maximum achievable bandwidth and the FOV; interestingly, however, the bandwidth reduction saturates beyond a certain FOV that depends on the NA of the metalens. These findings may provide important information and insights for the design of future wide-FOV achromatic flat lenses.

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“…To achieve an angle-dependent phase shift with a single metasurface, it would instead be necessary to design angledependent meta-atoms providing different phase shifts for different angles [35] or, more broadly, "nonlocal metasurfaces" with an overall angle-dependent response [36][37][38][39][40][41][42][43]. As further discussed in the Discussion section, nonlocal metasurfaces may provide some intriguing opportunities to overcome the limitations discussed in the following, which are based on the assumption of local interactions between incident the wave and meta-atoms.…”

Section: Ideal Metalens Phase Profilementioning

confidence: 99%

Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses

Shastri

Monticone

2022

EPJ Appl. Metamat.

View full text Add to dashboard Cite

Optical systems with wide field-of-views (FOV) are crucial for many applications such as high performance imaging, optical projection, augmented/virtual reality, and miniaturized medical imaging tools. Typically, aberration-free imaging with a wide FOV is achieved by stacking multiple refractive lenses (as in a “fisheye” lens), adding to the size and weight of the optical system. Single metalenses designed to have a wide FOV have the potential to replace these bulky imaging systems and, moreover, they may be dispersion engineered for spectrally broadband operation. In this paper, we derive a fundamental bound on the spectral bandwidth of dispersion-engineered wide-FOV achromatic metalenses. We show that for metalenses with a relatively large numerical aperture (NA), there is a tradeoff between the maximum achievable bandwidth and the FOV; interestingly, however, the bandwidth reduction saturates beyond a certain FOV that depends on the NA of the metalens. These findings may provide important information and insights for the design of future wide-FOV achromatic flat lenses.

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Thermal Metasurfaces: Complete Emission Control by Combining Local and Nonlocal Light-Matter Interactions

Cited by 63 publications

References 78 publications

A framework for scintillation in nanophotonics

A framework for scintillation in nanophotonics

Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses

Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses

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