Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Fan, Yubin; Liang, Hong; Li, Jensen; Tsai, Din Ping; Zhang, Shuang

doi:10.1021/acsphotonics.2c00816

Cited by 21 publications

(10 citation statements)

References 181 publications

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“…The diversity of degrees of freedom provided by this system can enable a wealth of applications in solid‐state colors, high‐density optical data storage and encryption. The polarization‐controlled spectral responses demonstrated in this work could be further extended with freeform and unconventional meta‐optics [ 29 ] and the assistance of artificial intelligence. [ 30 ]…”

Section: Discussionmentioning

confidence: 99%

Polarization‐Controlled Chromo‐Encryption

Wang

Martin

2023

Advanced Optical Materials

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illuminating a metasurface (encrypted information) with a modulated incident light (key). [15] Another group has patterned the encrypted information by encoding the orbital angular momentum helical phase and Fourier transform lens, such that when decrypting with correct keys (timedependent incident beams) the encrypted information becomes comprehensive. [16] In addition to reconstructing the information in the far field like holograms, encrypted metasurfaces composed of complex-amplitude units can be arranged into gray scale or color images. [17] Combining the channels in the far field and near field makes optical encryption more versatile, like in binary or color QR codes. [18] Since the spectral response of nanostructures is generally sensitive to the polarization orientation it can serve as key to decrypt information. [19] However, these encryption concepts are not yet utilized to their full potential. In this work, we use a simple geometry to demonstrate a plethora of spectral responses, which are then employed for encryption using a quaternary system.Here, we resort to silver (Ag) for its low losses in the visible. [20] Each color pixel (unit cell) contains a rectangular Ag nanorod on a dielectric pedestal that forms an aperture of similar geometry within an Ag mirror underneath (see Experimental Section). The unit cells are placed on a square array with period 300 nm, which prevents grating diffraction orders and Wood-Rayleigh anomalies at the visible wavelengths of interest. [21] The coupling between the nanostructures and the mirror plane is negligible since the pedestal height is larger than 80 nm. [22] The readout scheme is illustrated in Figure 1a, incident light (in black), passing through a linear polarizer and a polarization insensitive beam splitter, impinges on the sample. The reflected light (in red) is then analyzed with another polarizer (analyzer). When both polarizers are parallel with the nanostructures (horizontal, H-direction, Figure 1b), the observed colors are muted, with a low chroma caused by the low Ag absorption. When rotating both polarizers perpendicular to the nanostructures (vertical, V-direction, Figure 1c), all the colors appear grey due to the lack of dimensional variations in this direction. However, the colors become vivid and saturated when both polarizers are in the diagonal direction (+45°, D-direction), Figure 1d. This difference of color contrast controlled by the mere orientation of the polarization is quite baffling, since it contradicts our intuition that the response for diagonal polarization could be inferred from the superposition The response of simple plasmonic nanorods to polarized illumination is studied in detail. Depending on the orientation of that polarization with respect to the symmetry axes of the nanostructure, a chiral response can occur, which can be analyzed through a second polarizer, in order to control the spectral response of the system. Specifically, for the Ag nanorods fabricated here, a broad variety of colors can be produced that cover half ...

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Section: Discussionmentioning

confidence: 99%

Polarization‐Controlled Chromo‐Encryption

Wang

Martin

2023

Advanced Optical Materials

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“…They are compact and friendly in integration. [5][6][7][8][9][10][11][12] Meta-holograms have been widely developed [13][14][15][16][17][18][19][20][21] under the rising tide of metasurfaces. They can reach high efficiency and provide vivid displays, especially after combining them with quantum correlation imaging.…”

Section: Introductionmentioning

confidence: 99%

“…Metasurfaces are a kind of high-performance platform composed of a subwavelength antenna. They are compact and friendly in integration 5 – 12 Meta-holograms have been widely developed 13 – 21 under the rising tide of metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

Dual-channel quantum meta-hologram for display

Fan,

Liang,

Wang

et al. 2024

Adv. Photon. Nexus

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.Quantum technologies rely on creating and manipulating entangled sources, which are essential for quantum information, communication, and imaging. By integrating quantum technologies and all-dielectric metasurfaces, the performance of miniature display devices can be enhanced to a higher level. Miniature display technology, such as virtual reality display, has achieved original commercial success, and was initially applied to immersive games and interactive scenes. While the consumer market has quickly adopted this technology, several areas remain for improvement, including concerns around bulkiness, dual-channel display, and noise reduction. Here, we experimentally realize a quantum meta-hologram concept demonstration of a miniature display. We fabricate an ultracompact meta-hologram based on 1 μm thick titanium dioxide (TiO2). The meta-hologram can be remotely switched with heralding technique and is robust against noise with the quantum entangled source. The platform can alter the miniature display channel by manipulating heralding photons’ polarization, removing speckles and multiple reflective light noise, improving imaging contrast, and potentially decreasing device weight. Imaging contrast increases from 0.36 dB under speckle noise influences to 6.8 dB in quantum correlation imaging. This approach has the potential to miniaturize quantum displays and quantum communication devices.

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“…For example, chiral lasing [30] and quantum entanglement. [31,32] To address this challenge, the idea of combining high-Q quasi-BICs resonances with chirality seems promising. To this end, several pioneering studies reported on the creation of chiral quasi-BIC resonances with giant circular dichroism (CD) in dielectric platforms.…”

Section: Introductionmentioning

confidence: 99%

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Tang

Liang

Yao

et al. 2023

Laser & Photonics Reviews

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Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q‐factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from a fundamental trade‐off between Q‐factor and circular dichroism (CD), presenting a significant hurdle that severely limits the independent control between CD and Q‐factors. Here, 3D plasmonic metasurfaces are numerically demonstrated that overcome the trade‐off and offer high‐Q quasi‐BIC resonances (Q ≈ 938) with strong CD (≈0.67) in the mid‐infrared. These metasurfaces are made of integrated‐resonance units consisting of a twisted vertical split‐ring resonator (VSRR) and a wall. Importantly, this dissimilar dimer configuration unlocks a new degree of freedom to decouple the Q‐factor and CD, that is, the Q‐factor and CD can be relatively independently manipulated by the height of the wall and the twisted angle of the VSRR, respectively. These results provide novel paradigms to manipulate advanced chiroptical responses, with various applications that require strong CD with enhanced light–matter interaction.

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Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Cited by 21 publications

References 181 publications

Polarization‐Controlled Chromo‐Encryption

Polarization‐Controlled Chromo‐Encryption

Dual-channel quantum meta-hologram for display

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

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