Coherent Perfect Absorber for Arbitrary Wavefronts

Slobodkin, Yevgeny; Weinberg, Gil; Hörner, Helmut; Pichler, Kevin; Rotter, Stefan; Katz, Ori

doi:10.1364/fio.2022.jtu7b.5

Cited by 1 publication

(1 citation statement)

References 12 publications

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“…The non-monotonous decaying beam, as depicted in Figure 3a, which corresponds to a linear combination of different modes along the y-direction, opens up potential applications where lower intensity at the boundaries is a critical parameter. For example, enabling non-invasive medical imaging and laser treatment for subcutaneous cells (Figure 3b), or indoor improved telecommunication signal transmission, in Fig 3c . Furthermore, although originally developed for electromagnetic scenarios, due to the symmetry between light and acoustics, experimental realization might be more feasible with sound waves, [16][17][18] employing suitable modified theoretical model. Currently, the focus in the field of sound waves is primarily on random media rather than opaque materials.…”

Section: Discussionmentioning

confidence: 99%

Material losses in Helmholtz equation: from polarisation-loss locking to lossy wave-vectors transmission via passive metasurface

Perea-Puente¹,

Rodríguez-Fortuño²

2023

SPIE Future Sensing Technologies 2023

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Yielding on the intimate link between losses and polarization of the evanescent profile in optical waveguide via complex wave-vector polarization-loss locking phenomena was discussed in the context of spin orbit interactions of light. Inspired by this, we conducted an investigation into a novel method to achieve improved transmission of light across optically opaque materials showing Helmholtz equation solution for complex values introducing a passive metasurface placed on the boundaries of the material, affecting transmission coefficients for phase and amplitude simultaneously. This approach resulted in a non-monotonic beam penetrating inside the lossy material, enhancing its intensity while reducing its amplitude near the interface. Such proposal have interesting applications in various scenarios, including acoustic isolation, sensing technologies via grid metasurface matching, improved telecommunications transmission in homogeneous materials, or enhanced laser resilience in biological tissues for subcutaneous imaging or treatment. Furthermore, our theoretical approach paves the way for potential realization in similar physical systems, ranging from near-zero-index materials to purely plasmonic interfaces, offering a comprehensive overview of the formalism.

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Section: Discussionmentioning

confidence: 99%