The limitation on the modulation speed of a cavity-based optical modulator posed by cavity linewidth can be circumvented modulating coupling rate to cavity. However, most methods cannot control this in isolation cavity's refractive index. Here, we report method purely modulate exploiting an analogue superradiance array bidirectionally interacting microring cavities. Unlike existing schemes, our does not require perturbation or cavity–waveguide region. We experimentally demonstrate tuning...

Abstract The ability to tailor light–matter interactions using artificially engineered materials has opened up new avenues for secure data storage and communication. This work presents an experimental investigation of metasurfaces secure, multi‐channel image encryption in the infrared (IR). proposed consist array pixels, each designed produce a wavelength‐ polarization‐dependent IR absorptivity. A basis set pixels is encrypting images arbitrary resolution on given number wavelength...

The ability to design multi-resonant thermal emitters is essential the advancement of a wide variety applications, including management and sensing. These fields would greatly benefit from development more efficient tools for predicting spectral response coupled, multi-resonator systems. In this work, we propose semi-analytical prediction tool based on coupled-mode theory. our approach, complex emitter fully described by set parameters, which can be straightforwardly calculated simulations...

The ability of metamaterials to manipulate optical waves in both the spatial and spectral domains has provided new opportunities for image encoding. Combined with recent advances hyperspectral imaging, this suggests exciting possibilities development secure communication systems. While traditional encryption approaches perform a 1-to-1 transformation on plain form cipher image, we propose 1-to-n scheme. Plain data is dispersed across n seemingly random images, each transmitted separate...

We design thermal emitters based on gold micrograting structures with VO2-filled slots for enhanced far-field rectification. numerically calculate the rectification ratio two different approaches, peak extinction and shift. In extinction, VO2 phase transition switches radiative coupling of surface plasmon off. shift, shifts wavelength radiatively-coupled plasmon. vary coefficient to determine effect each approach. both cases, can be increased by increasing loss in metallic state. This...

Rapid advancements in autonomous systems and the Internet of Things have necessitated development compact low-power image sensors to bridge gap between digital physical world. To that end, sub-wavelength diffractive optics, commonly known as meta-optics, garnered significant interest from optics photonics community due their ability achieve multiple functionalities within a small form factor. Despite years research, however, performance meta-optics has often remained inferior compared...

We propose a gold nanostructured design for absorption enhancement in thin black phosphorus films the 3-5 µm wavelength range. By suitably tuning parameters of metal-insulator-metal (MIM) structure, lateral resonance modes can be excited layer. compare due to resonant light trapping effect conventional 4n2 limit. For layer thickness 5 nm, we achieve an factor 561 at 4 µm. This is significantly greater than limit 34. The ability strong ultrathin dielectric layers, coupled with unique...

The ability to tailor the spectral response of photonic devices is paramount advancement a broad range applications. vast design space offered by disordered optical media provides enhanced functionality for tailoring while also making it challenging map properties such complex systems their structural attributes. In this work, we investigate correlations between configuration statistics random metasurfaces and transmissivity in visible, leverage those develop reduced phase space. latter part...

We propose a strategy to design infrared emitters with predefined spectral response using aluminum gratings as building blocks. begin by identifying 3 target spectra resonances in the 7-15 µm wavelength range. Next, we use FDTD simulations and interpolation create reference library of relating their structural parameters attributes spectra. By search algorithm based on minimization errors attributes, identify from this corresponding peaks Finally, discuss an approach for designing hybrid...

We propose gold-vanadium dioxide microstructures for which the difference in thermally radiated power between low and high temperature states can be tuned via structural design. start by incorporating <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msub> <mml:mi mathvariant="normal">V</mml:mi> mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> a gold-dielectric-gold waveguide to achieve...

The ability of metasurfaces to manipulate optical waves in the spatial and spectral domain provides new avenues for secure data storage. In this work, an encryption system consisting electrically tunable metasurface a matched detector is presented grayscale images 8–12 μm wavelength range. proposed scheme, encrypted image corresponds spatially varying thermal intensity as captured by its detector. contrast previous metasurface‐based schemes, current approach leverages full response...

We explore the use of tunable inter-resonator coupling to reshape spectral absorptivity a graphene-based metamaterial. The metamaterial comprises periodic array coupled metal-insulator-metal resonators, with two resonators per unit cell. One resonator supports bright mode, and other dark mode. coupled-mode theory show that, by tuning resonant wavelength mode through spectrum can be reconfigured from single-peak shape split-peak shape. then propose specific, realistic device geometries allow...

We propose an all-silicon metasurface doublet that performs imaging in the mid-infrared only along a predefined light propagation direction. As second application, we optimize two metasurfaces to perform when used conjunction with each other.

We propose electrically reconfigurable absorbers with switchable narrowband resonances in the infrared. Our consist of two coupled, identical resonators and support a dark supermode. show that by dynamically breaking symmetry system, supermode can be made to couple an incoming plane wave, producing absorption peak spectrum. use this effect design optimize consisting coupled metal-insulator-metal based on gallium arsenide. switching functionality designed device is robust fabrication...

We investigate correlations between the spectral responses of one- and two-dimensional random arrays particles their configuration statistics. exploit these for prediction such complex systems in visible wavelength range.

Many of the present-day optical devices use photonic crystals. These are multilayers dielectric media that control reflection and transmission light falling on them. In this paper, we study properties periodic, fractal, aperiodic crystals compare them based their attributes. Our calculations band reflectivity degree robustness reveal novel features, e.g., fractal found to reflect maximum amount incident light. On other hand, have largest immunity disorder. We believe such will be useful in a...

We propose to use aluminum gratings design absorbers with predefined spectral response. By exploiting the relations between grating structural parameters and properties, we hybrid generate multi-resonance spectra.