TY - JOUR
T1 - Multiresonant Nonlocal Metasurfaces
AU - Zhou, You
AU - Guo, Shuwei
AU - Overvig, Adam Christopher
AU - Alù, Andrea
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/7/26
Y1 - 2023/7/26
N2 - Optical metasurfaces supporting localized resonances have become a versatile platform for shaping the wavefront of light, but their low quality (Q-) factor modes inevitably modify the wavefront over extended momentum and frequency space, resulting in limited spectral and angular control. In contrast, periodic nonlocal metasurfaces have been providing great flexibility for both spectral and angular selectivity but with limited spatial control. Here, we introduce multiresonant nonlocal metasurfaces capable of shaping the spatial properties of light using several resonances with widely disparate Q-factors. In contrast to previous designs, the narrowband resonant transmission punctuates a broadband resonant reflection window enabled by a highly symmetric array, achieving simultaneous spectral filtering and wavefront shaping in the transmission mode. Through rationally designed perturbations, we realize nonlocal flat lenses suitable as compact band-pass imaging devices, ideally suited for microscopy. We further employ modified topology optimization to demonstrate high-quality-factor metagratings for extreme wavefront transformations with large efficiency.
AB - Optical metasurfaces supporting localized resonances have become a versatile platform for shaping the wavefront of light, but their low quality (Q-) factor modes inevitably modify the wavefront over extended momentum and frequency space, resulting in limited spectral and angular control. In contrast, periodic nonlocal metasurfaces have been providing great flexibility for both spectral and angular selectivity but with limited spatial control. Here, we introduce multiresonant nonlocal metasurfaces capable of shaping the spatial properties of light using several resonances with widely disparate Q-factors. In contrast to previous designs, the narrowband resonant transmission punctuates a broadband resonant reflection window enabled by a highly symmetric array, achieving simultaneous spectral filtering and wavefront shaping in the transmission mode. Through rationally designed perturbations, we realize nonlocal flat lenses suitable as compact band-pass imaging devices, ideally suited for microscopy. We further employ modified topology optimization to demonstrate high-quality-factor metagratings for extreme wavefront transformations with large efficiency.
KW - High-Q nanophotonics
KW - imaging
KW - large-angle beam steering
KW - meta-grating
KW - nonlocal flat optics
UR - http://www.scopus.com/inward/record.url?scp=85164315414&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85164315414&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.3c00772
DO - 10.1021/acs.nanolett.3c00772
M3 - Article
C2 - 37307588
AN - SCOPUS:85164315414
SN - 1530-6984
VL - 23
SP - 6768
EP - 6775
JO - Nano Letters
JF - Nano Letters
IS - 14
ER -