Correlated Disordered Plasmonic Nanostructures Arrays for Augmented Reality

Plasmonic resonators are excellent candidates to control reflectance of functionalized substrates. Because of their subwavelength characteristic dimensions, they can even be used to modify the color of transparent glass plates without altering the transparency quality. Their spatial arrangement must be carefully chosen so that the plates do not produce nonspecular diffraction, whatever their spatial density. We compare here the response of silver nanoparticles (NPs) arrays with different NPs sizes, spatial densities, and arrangements (periodic and correlated disordered). The effects of these geometrical parameters are analyzed in detail by measuring the reflectance and transmittance spectra in visible wavelength. We show that correlated disordered gratings attenuate diffraction effects appearing at lower spatial densities while keeping similar reflectance and transmittance responses and maintaining clear transparency of the glass plate. Promising configurations for head-up displays and applications in augmented reality emerge from this study

Compact Implementation of a 1‑Bit Adder by Coherent 2‑Beam Excitation of a Single Plasmonic Cavity

We demonstrate experimentally the dual beam optical drive of an interconnect-free 2-input, 2-output 1-bit adder implemented inside a single gold plasmonic cavity, focused ion milled in an ultrathin single crystalline gold microplate. To obtain this result, we have set a coherent 2-beam excitation scheme up that allows us to independently and arbitrarily choose the intensity, polarization, and relative phase shift of two femtosecond-pulsed laser spots. The spots are focused on any chosen location of the micrometer-sized plasmonic cavity. The nonlinear photoluminescence (NPL) response of the cavity encodes the Boolean output, while the Boolean inputs are borne by the linear polarizations of the excitation. A generic map analysis tool is developed to pinpoint the realized Boolean functions and to assess their robustness. This tool is used to demonstrate the experimental implementation of the elusive XOR gate and its combination with an AND gate in the same cavity to perform the full 1-bit adder. The analysis of 160,000 instances of the 1-bit adder clearly shows the soundness of our approach and reveals some underlying mechanistic features of the remotely generated NPL. These results establish the first practical step of a general approach to cascade-free all-optical arithmetic and logic units