Abstract:Multiphoton absorption and luminescence are fundamentally important nonlinear processes for utilizing efficient light−matter interaction. Resonant enhancement of nonlinear processes has been demonstrated for many nanostructures; however, it is believed that all higher-order processes are always much weaker than their corresponding linear processes. Here, we study multiphoton luminescence from structured surfaces and, combining multiple advantages of perovskites with the concept of metasurfaces, we demonstrate … Show more
“…In addition, the threshold of two-photon emission was comparable with that of onephoton emission. [262] Zhao et al reported the two-photon pumped ASE from perovskite single crystal (Figure 15d). The threshold and optical gain of perovskite laser were 0.65 mJ cm −2 and 38 cm −1 .…”
Section: Light Emission Modulation With Photonic Structuresmentioning
Metal halide perovskite, an emerging photosensitive semiconductor, has been widely employed in solar cells, light‐emitting diodes, photodetectors, and lasers owing to its excellent photophysical properties and simple solution preparation processing. However, as a photoactive layer, the higher refractive index and thinner thickness of perovskite film can cause reflection and transmission at the interface, and confine the emitted light within devices, resulting in the poor incident photon absorption and emitted photon extraction. In addition, the intrinsic brittleness of perovskite material restricts its potential applications in flexible optoelectronics. Therefore, great effort has been put into micro‐nano structured perovskite optoelectronics, and the reported reviews mainly focus on the fabrication process of micro‐nano patterned perovskite. Herein, the functionalities of micro‐nano structures in optoelectronics, including improving the light trapping, light extraction, light modulation, carrier dynamics, mechanical robustness, and other novel functionalities, are comprehensively reviewed. The specific applications of these functionalities in perovskite‐based optoelectronic devices are then discussed in detail to provide a better understanding of the photophysical properties of micro‐nano structure functionalized optoelectronics. Finally, promising strategies to promote the multifunctional commercial applications of micro‐nano structured perovskite optoelectronics are provided.
“…In addition, the threshold of two-photon emission was comparable with that of onephoton emission. [262] Zhao et al reported the two-photon pumped ASE from perovskite single crystal (Figure 15d). The threshold and optical gain of perovskite laser were 0.65 mJ cm −2 and 38 cm −1 .…”
Section: Light Emission Modulation With Photonic Structuresmentioning
Metal halide perovskite, an emerging photosensitive semiconductor, has been widely employed in solar cells, light‐emitting diodes, photodetectors, and lasers owing to its excellent photophysical properties and simple solution preparation processing. However, as a photoactive layer, the higher refractive index and thinner thickness of perovskite film can cause reflection and transmission at the interface, and confine the emitted light within devices, resulting in the poor incident photon absorption and emitted photon extraction. In addition, the intrinsic brittleness of perovskite material restricts its potential applications in flexible optoelectronics. Therefore, great effort has been put into micro‐nano structured perovskite optoelectronics, and the reported reviews mainly focus on the fabrication process of micro‐nano patterned perovskite. Herein, the functionalities of micro‐nano structures in optoelectronics, including improving the light trapping, light extraction, light modulation, carrier dynamics, mechanical robustness, and other novel functionalities, are comprehensively reviewed. The specific applications of these functionalities in perovskite‐based optoelectronic devices are then discussed in detail to provide a better understanding of the photophysical properties of micro‐nano structure functionalized optoelectronics. Finally, promising strategies to promote the multifunctional commercial applications of micro‐nano structured perovskite optoelectronics are provided.
“… Fig. 12 Light-emitting metasurfaces a Modal structure of symmetric and symmetry broken semiconductor metasurfaces [ 47 ], b Unidirectional luminescence from the InGaN/GaN quantum-well metasurface [ 48 ], c Active perovskite hyperbolic metasurface with deep-subwavelength alternating layers [ 49 ], d Light-emitting metalenses and meta-axicons for focusing and beaming of spontaneous emission [ 50 ], and e Enhanced multiphoton processes in perovskite metasurfaces [ 51 ] …”
Section: Light-emitting Metasurfacementioning
confidence: 99%
“…demonstrated the enhanced multiphoton processes in perovskite metasurfaces, as shown in Fig. 12 e [ 51 ]. The proposed perovskite metasurfaces reveal a great efficiency in the nonlinear multiphoton processes, which is comparable to that in linear counterpart.…”
Section: Light-emitting Metasurfacementioning
confidence: 99%
“…However, the separation of light-matter interaction, namely these fabricated artificial structures, and the light-emitting materials is still remained. Opportunely, several attempts and even for the field of nonlinear optics are proposed, demonstrating direct light-emitting metasurfaces with arbitrary functionalities [ 45 – 51 ]. Thus, with these efforts, the anticipation toward ultracompact nanophotonics with metasurfaces for structured-light projection in simplicity can be expected in the near future, as shown in Fig.…”
Internet of Things (IoT) technology is prosperous for the betterment of human well-being. With the expeditious needs of miniature functional devices and systems for adaptive optics and light manipulation at will, relevant sensing techniques are thus in the urgent stage of development. Extensive developments in ultrathin artificial structures, namely metasurfaces, are paving the way for the next-generation devices. A bunch of tunable and reconfigurable metasurfaces with diversified catalogs of mechanisms have been developed recently, enabling dynamic light modulation on demand. On the other hand, monolithic integration of metasurfaces and light-emitting sources form ultracompact meta-devices as well as exhibiting desired functionalities. Photon-matter interaction provides revolution in more compact meta-devices, manipulating light directly at the source. This study presents an outlook on this merging paradigm for ultracompact nanophotonics with metasurfaces, also known as metaphotonics. Recent advances in the field hold great promise for the novel photonic devices with light emission and manipulation in simplicity.
“…The enhancement of multiphoton-photoluminescence was also demonstrated in dielectric nanoantennas and metasurfaces, − and was exploited for optical encoding using mid-index lead halide perovskite as the dielectric, as well as for mapping the magnetic field profile of the excitation beam . The imaging of anapole states and higher order modes inside dielectric nanoantennas through THG scanning was also demonstrated. , …”
Section: Nonlinear Wavefront Control
and Imagingmentioning
High-index dielectric nanostructures
can support optical resonances
of electric and magnetic character with ultralow linear absorption.
In contrast to plasmonics, they can be engineered to confine electromagnetic
fields inside the resonator, amplifying intrinsic nonlinearities of
the dielectric. In this Review I examine the ability of dielectric
nanoantennas and metasurfaces for efficient harmonic generation and
wave-mixing processes, as well as nonlinear wavefront manipulation
of the incident and radiated light. A detailed comparison is made
between the many nanoscopic dielectric configurations reported in
the literature, evaluating the influence of the material, crystal
symmetry, structure geometry, and the different resonances involved
(electric and magnetic Mie modes, Fano resonances, and quasi-nonradiative
states, including anapoles and quasi-bound states in the continuum).
The nonlinear performance of the nanosystems is analyzed, with emphasis
on frequency conversion efficiency and emission directionality control,
also discussing recent advances in nonlinear imaging, nonlinear holography,
and all-optical switching. The role of topology in nonlinear nanophotonics
is reviewed in the end, and potential future directions in the field
are laid out.
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