Complex-Birefringent Dielectric Metasurfaces for Arbitrary Polarization-Pair Transformations

Lung, Shaun; Wang, Kai; Kamali, Khosro Zangeneh; Zhang, Jihua; Rahmani, Mohsen; Neshev, Dragomir N.; Sukhorukov, Andrey A.

doi:10.1021/acsphotonics.0c01044

Cited by 21 publications

(15 citation statements)

References 33 publications

(78 reference statements)

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“…Importantly, with our proposed configuration, direct generation of CPL from single-photon sources (such as molecules, atomic defects, or quantum dots) that typically emit light in the form of linear optical dipoles, is possible, without the need for coupling with chiral nanoantennas, or operation under high magnetic fields at very low temperatures to achieve chiral emission. [37][38][39] Compared to modern bulk, [51][52][53] and even modern metamaterial polarization converters, [4][5][6][7][8][9][10][11][12][13] the proposed BP array is ideal for device miniaturization as the BP patches have nanoscale dimensions and the BP layer itself is atomically thin. The plasmon dispersion of BP for increasing number of layers (up to ≈20 nm thick films) versus the carrier concentration remains mostly unchanged, simply scaling as n β where β < 1/2 (instead of the single layer scaling of n 1/2 ).…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3] In recent years, several approaches have been proposed in order to achieve the desired polarization control. Metallic metasurfaces sustaining strong plasmonic modes [4][5][6][7][8] , dielectric resonators utilizing Mie modes [9] and all-dielectric metasurfaces [8,[10][11][12][13] have provided the desired functionalities within electrically thin volumes. To achieve cross-polarization conversion, these structures involve anisotropic [14,15] or chiral geometries, [16][17][18] which are often complex.…”

Section: Dynamic Control Of Light Chirality With Nanostructured Monol...mentioning

confidence: 99%

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Dynamic Control of Light Chirality with Nanostructured Monolayer Black Phosphorus for Broadband Terahertz Applications

Matthaiakakis

Droulias

Kakarantzas

2022

Advanced Optical Materials

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Dynamically tunable polarization conversion at the nanoscale is essential for the realization of novel on‐chip photonic devices. To achieve the desired polarization control, typically, nanopatterning of resonant metallic or dielectric structures in anisotropic or chiral geometries is required, in many cases limiting the performance to narrowband, nontunable operation. In this work, by taking advantage of the strong anisotropic surface conductivity of black phosphorus (BP), polarization conversion is demonstrated via the coherent excitation of localized surface plasmons (LSPs) in symmetrically patterned monolayer BP nanosquare arrays. Using finite‐difference time‐domain simulations, linear‐to‐circular and circular‐to‐linear polarization conversion, dynamic tunability and switching, and broadband operation in the terahertz (THz) regime, all enabled by means of electrostatic control of the carrier concentration of BP, are demonstrated. Last, it is demonstrated how near‐field coupling between the LSPs and dipole emitters positioned at chosen hotspots can mediate the emission of circularly polarized light (CPL), also providing enhanced emission rates. The proposed design offers a flexible, ultrathin, platform for wave manipulation in the THz regime, enabling active control of light polarization by nanoscopic on‐chip optical sources.

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Section: Discussionmentioning

confidence: 99%

Section: Dynamic Control Of Light Chirality With Nanostructured Monol...mentioning

confidence: 99%

Dynamic Control of Light Chirality with Nanostructured Monolayer Black Phosphorus for Broadband Terahertz Applications

Matthaiakakis

Droulias

Kakarantzas

2022

Advanced Optical Materials

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“…On the other hand, we aim to have fully orthogonal outputs. Such task of non-orthogonal to orthogonal mapping can be realized by a specially optimized non-conservative linear transformation only for a set of two complex input vectors [43,44]. However, for a set with three or more input elements, nonlinear trans- formation is required for complete discrimination, and we illustrate how this can be accomplished by the SPL training for inference.…”

Section: Inference Training For the Discrimination Of Input Statesmentioning

confidence: 99%

Optical Neural Network Based on Synthetic Nonlinear Photonic Lattices

Pankov,

Vatnik,

Sukhorukov

2021

Preprint

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We reveal that a synthetic photonic lattice based on coupled optical loops can be utilized as a neural network for processing of optical pulse sequences in time domain. As a proof-of-concept, we train the optical system to restore an initial shape of the pulse train from the signal distorted due to linear dispersion in a fiber-optic link. We also show efficient training of the optical network with an intrinsic Kerr-type nonlinearity for the realization of target nonlinear transmission functions and inference functionality for the discrimination of different pulse sequences. The theoretical modeling is performed under practical conditions and can guide future experimental realizations.

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“…We note that the po-larization transformations in principle can also be implemented with a collection of bulk optical elements; however, at the expense of complex designs sensitive to alignment. Here we show that these polarization manipulations can be realized using nanostructured dielectric metasurfaces, which can effectively act as partial polarizers in arbitrary elliptical bases with any required extinction ratio [7,42]. Each metasurface is a flat optical element composed of a periodically repeated array of nano-resonators called meta-gratings.…”

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confidence: 93%

Metasurface-Assisted Quantum Ghost Discrimination of Polarization Objects

Vega,

Pertsch,

Setzpfandt

et al. 2021

Preprint

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We develop a concept of metasurface-assisted ghost imaging for non-local discrimination between a set of polarization objects. The specially designed metasurfaces are incorporated in the imaging system to perform parallel state transformations in general elliptical bases of quantum-entangled or classically-correlated photons. Then, only four or fewer correlation measurements between multiple metasurface outputs and a simple polarization-insensitive bucket detector after the object can allow for the identification of fully or partially transparent polarization elements and their arbitrary orientation angles. We rigorously establish that entangled photon states offer a fundamental advantage compared to classical correlations for a broad class of objects. The approach can find applications for real-time and low-light imaging across diverse spectral regions in dynamic environments.

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Complex-Birefringent Dielectric Metasurfaces for Arbitrary Polarization-Pair Transformations

Cited by 21 publications

References 33 publications

Dynamic Control of Light Chirality with Nanostructured Monolayer Black Phosphorus for Broadband Terahertz Applications

Dynamic Control of Light Chirality with Nanostructured Monolayer Black Phosphorus for Broadband Terahertz Applications

Optical Neural Network Based on Synthetic Nonlinear Photonic Lattices

Metasurface-Assisted Quantum Ghost Discrimination of Polarization Objects

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