See-through reflective metasurface diffraction grating

Nikolov, Daniel; Cheng, Fei; Ding, Lei; Bauer, Aaron; Vamivakas, A. Nick; Rolland, Jannick P.

doi:10.1364/ome.9.004070

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…The ruby laser material shows the sharp line emission at 694.3 nm, [ 17 ] but many tungstate and molybdate crystals are reported to be the candidates for broadband laser applications such as MgMoO 4 :Cr 3+ , NaAl(WO 4 ) 2 :Cr 3+ , Al 2 (WO 4 ) 3 :Cr 3+ , Sc 2 (WO 4 ) 3 :Cr 3+ , Sc 2 (MoO 4 ) 3 :Cr 3+ , etc. [ 19,197–199 ] The tunable solid‐state lasers have caused extensive attention due to their wide applications in medicine, communication, ultrashort pulse generation and military fields. [ 200 ] As shown in Table 7 , the Cr 3+ ‐doped tungstate and molybdate materials usually possess the broad emission band and the long PL peak wavelength.…”

Section: Advances In Chromium‐activated Phosphors: Structure Properti...mentioning

confidence: 99%

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

252

145

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Cr3+/Cr4+‐activated near‐infrared (NIR) luminescent materials have attracted extensive attention owing to their tunable emission wavelength and widespread applications in plant growth, food analysis, biomedical imaging, night vision, and so on. Plenty of excellent NIR materials are developed by introducing Cr3+/Cr4+ ion to various inorganic hosts. Herein, the effect of crystal field on Cr3+/Cr4+ luminescence by combining the Tanabe–Sugano energy level diagram and configuration coordinate model is discussed. Research progress of Cr3+/Cr4+‐doped NIR luminescent materials, including the phosphors designed from structural models with octahedral, tetrahedral, and other coordination types, is then outlined. The luminescence properties of more than 200 kinds of Cr3+/Cr4+‐doped materials are summarized. In particular, several strategies for tuning emission wavelength, broadening emission band, enhancing NIR luminescence efficiency, and improving thermal stability, are listed. Finally, the current challenges and future prospects in the research of Cr3+/Cr4+‐doped NIR luminescent materials are presented. This review will contribute to a deeper understanding of not only Cr3+/Cr4+ luminescence mechanism but also the current research progress of chromium‐doped luminescent materials, so as to develop more Cr3+/Cr4+‐activated NIR luminescent materials with better performance and explore more applications.

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Section: Advances In Chromium‐activated Phosphors: Structure Properti...mentioning

confidence: 99%

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Zhao

Song

Liu

2022

Laser & Photonics Reviews

252

145

View full text Add to dashboard Cite

show abstract

“…Alternatively, we could have added the coma contribution to the freeform substrate. The main decision to integrate coma within the metasurface instead was twofold: (i) to significantly simplify the writing process of the metasurface on an already curved and complexly shaped substrate and (ii) to avoid having to create an even more complexly shaped substrate that would be used in transmission in a see-through architecture ( 43 ). Thus, the phase contributions for each surface were chosen deliberately, considering the entire design-to-manufacture chain of both the freeform substrate and the metasurface.…”

Section: Resultsmentioning

confidence: 99%

“…It is inherently opaque due to the Ag backplate required for the function of the metal-dielectric-metal metasurface. This limitation can be overcome by using an array of apertures with random positions and random diameters much larger than the visible wavelength ( 43 ). The see-through ratio can be adjusted by varying the diameter and density of the apertures.…”

Section: Discussionmentioning

confidence: 99%

Metaform optics: Bridging nanophotonics and freeform optics

et al. 2021

Self Cite

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The demand for high-resolution optical systems with a compact form factor, such as augmented reality displays, sensors, and mobile cameras, requires creating new optical component architectures. Advances in the design and fabrication of freeform optics and metasurfaces make them potential solutions to address the previous needs. Here, we introduce the concept of a metaform—an optical surface that integrates the combined benefits of a freeform optic and a metasurface into a single optical component. We experimentally realized a miniature imager using a metaform mirror. The mirror is fabricated via an enhanced electron beam lithography process on a freeform substrate. The design degrees of freedom enabled by a metaform will support a new generation of optical systems.

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“…They can precisely control the wavefront of light via subwavelength structures with high degrees of freedom. Various metasurface devices, such as gratings [6][7][8][9], lenses [10][11][12], holograms [13][14][15][16][17][18][19], and optical vortex plates [20][21][22], have been developed to realize versatile functionalities.…”

mentioning

confidence: 99%

Ultracompact multifunctional metalens visor for augmented reality displays

Chen

Liang

et al. 2022

PhotoniX

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Virtual reality (VR) and augmented reality (AR) have found widespread applications in education, engineering, healthcare, and entertainment. However, these near-eye displays are often bulky and heavy, and thus are not suitable for long-term wearing. Metalenses, with an ultra-thin formfactor, subwavelength modulation scale, and high modulation flexibility, are promising candidates to replace the conventional optics in AR display systems. In this work, we proposed and fabricated a novel reflective dielectric metalens-visor based on Pancharatnam-Berry phase with see-through capability. It achieves diffraction-limited focusing behavior for the reflected red light, while keeping a good transmission spectrum in the visible region. Hence, this single piece metalens-visor can perform the function of two integrated elements simultaneously: an eyepiece and an optical combiner, which in turn greatly reduces the weight and the size of an AR display. We have implemented a proof-of-concept AR display system employing the metalens-visor, and experimentally demonstrated color AR images with good image quality. This work reveals the great potential of multi-functional metasurface devices which enables optical integration in interdisciplinary applications including wearable displays, biological imaging, and aeronautic optical instruments.

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See-through reflective metasurface diffraction grating

Cited by 7 publications

References 23 publications

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources

Metaform optics: Bridging nanophotonics and freeform optics

Ultracompact multifunctional metalens visor for augmented reality displays

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