Wavefront shaping with a tunable metasurface: Creating cold spots and coherent perfect absorption at arbitrary frequencies

Frazier, Benjamin W.; Antonsen, Thomas M.; Anlage, Steven M.; Ott, Edward

doi:10.1103/physrevresearch.2.043422

Cited by 30 publications

(27 citation statements)

References 56 publications

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“…into analog waveforms by an AWG (arbitrary waveform generator) and stored for both the training and testing time-series data sets. After appropriate time scaling, the input signal is then amplified and injected into a wave chaotic microwave cavity [25][26][27][28][29][30].…”

Section: Reservoir Computingmentioning

confidence: 99%

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Short-wavelength Reverberant Wave Systems for Enhanced Reservoir Computing

Antonsen

Anlage

et al. 2021

Preprint

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Machine learning (ML) has found widespread application over a broad range of important tasks. To enhance ML performance, researchers have investigated computational architectures whose physical implementations promise compactness, high-speed execution, physical robustness, and low energy cost. Here, we experimentally demonstrate an approach that uses the high sensitivity of reverberant short wavelength waves for physical realization and enhancement of computational power of a type of ML known as reservoir computing (RC). The potential computation power of RC systems increases with their effective size. We here exploit the intrinsic property of short wavelength reverberant wave sensitivity to perturbations to expand the effective size of the RC system by means of spatial and spectral perturbations. Working in the microwave regime, this scheme is tested on different ML tasks. Our results indicate the general applicability of reverberant wave-based implementations of RC and of our effective reservoir size expansion techniques.

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Section: Reservoir Computingmentioning

confidence: 99%

“…2b and c 3-5 with a single cavity. E.g., one attractive possibility is to place a metasurface with electronically programmable surface impedance elements on a portion of the cavity wall [30][31][32][33] and electronically switch between many different surface impedance distributions.…”

Section: Reverberant Wave Rcmentioning

confidence: 99%

Short-wavelength Reverberant Wave Systems for Enhanced Reservoir Computing

Antonsen

Anlage

et al. 2021

Preprint

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“…Wave-chaotic phenomena have been studied in various systems, ranging from 1D graphs [1][2][3][4][5], 2D billiards [6][7][8][9][10][11][12] to 3D enclosures [13][14][15][16][17][18]. The statistical properties of many system quantities, such as the closed system eigenvalues and the open system scattering/impedance matrices, exhibit universal characteristics, which only depend on general symmetries (e.g., time-reversal, symplectic) and the degree of system loss.…”

Section: Introductionmentioning

confidence: 99%

Eigenfunction and eigenmode-spacing statistics in chaotic photonic crystal graphs

Ma¹,

Antonsen²,

Ott³

et al. 2021

Preprint

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The statistical properties of wave chaotic systems of varying dimensionalities and realizations have been studied extensively. These systems are commonly characterized by the statistics of the short-range and long-range eigenmode-spacing, and the one-point and two-point eigenfunction correlations. Here, we propose photonic crystal (PC) defect waveguide graphs as an alternative physical system for chaotic graph studies. Photonic crystal graphs have two novel features, namely an unusual dispersion relation for the propagating modes, and complex scattering properties of the junctions and bends. Recent studies reveal that chaotic graphs possess non-universal properties, which may be better analyzed and understood through eigenfunction analysis. Here we present numerically determined properties of an ensemble of such PC-graphs including both eigenfunction amplitude and eigenmode-spacing studies. Our proposed system is amenable to other statistical studies, and may be realized experimentally.

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“…CPA is the time-reverse of lasing at threshold [26,27] and a gener-alization of the critical coupling condition [24,28]. CPA has been implemented in a wide range of regular scattering systems [29], as well as in disordered matter [30][31][32][33][34][35]. The latter has been achieved in particular through purposeful perturbations of the scattering system, which can include additional constraints, such as on frequency or CPA wavefront [30,[32][33][34].…”

mentioning

confidence: 99%

“…CPA has been implemented in a wide range of regular scattering systems [29], as well as in disordered matter [30][31][32][33][34][35]. The latter has been achieved in particular through purposeful perturbations of the scattering system, which can include additional constraints, such as on frequency or CPA wavefront [30,[32][33][34]. When two CPA-states coalesce, the broadened lineshape of the absorption spectrum indicates the existence of perfectly absorbing EPs [19][20][21].…”

mentioning

confidence: 99%

Exceptional points of PT-symmetric reflectionless states in complex scattering systems

Ferise,

del Hougne,

Félix

et al. 2021

Preprint

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Wavefront shaping with a tunable metasurface: Creating cold spots and coherent perfect absorption at arbitrary frequencies

Cited by 30 publications

References 56 publications

Short-wavelength Reverberant Wave Systems for Enhanced Reservoir Computing

Short-wavelength Reverberant Wave Systems for Enhanced Reservoir Computing

Eigenfunction and eigenmode-spacing statistics in chaotic photonic crystal graphs

Exceptional points of PT-symmetric reflectionless states in complex scattering systems

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