This talk will report on the use of two different photoswitch-containing polymers for metasurface resonance tuning. Each photoswitch can be independently coated on a metasurface, and induce either red- or blueshifts in the metasurface resonance. However, the disparate wavelength tuning of the two photoswitches means they can also be used in combination. We demonstrate that light-responsive photoswitches can be employed alone, or in combination with other stimuli, to add advanced functionality to metasurface resonance tuning and enable potential applications in logic processing or optical neural networks.
Subwavelength size of nanophotonic devices in use with laser pulses at the few-cycle limit raises new questions about the spatial distribution of the carrier-envelope phase (CEP). It has been shown that the complexity of the CEP distribution for few-cycle laser pulses can go far beyond the axial phase flip, known as the Gouy phase. Moreover, the phase landscape is governed by various laser parameters, some of which can be deliberately changed in order to control the CEP distribution. To be able to fully grasp the control over CEP an accessible and reliable way to measure the distribution is needed. The measurement of CEP distribution of few-cycle laser pulses is challenging and the method so far relies on vacuum apparatus. Recently discovered light-driven CEP sensitive currents in dielectrics, which can be detected with microsized on-chip electrodes, offer a new perspective for the phase detection. In this work, we present a proof-of-principle method for measuring the CEP spatial distribution. With on-chip scanning the focal volume of tightly focused oscillator laser pulses we obtain the three-dimensional map of the phase with resolution down to 500 nm.
This conference presentation, “Structural and optical properties of atomically engineered Ir/Al2O3 nanocomposites” was presented at the Nonlinear Optics and its Applications 2022 conference at SPIE Photonics Europe 2022.
Optical surfaces are achieving increasingly complex shapes which brings out challenges to functionalize them conformally for improved performance. Besides, plastic optics pose a great challenge on coating technologies due to their large coefficient of thermal expansion and poor adhesion of functional coatings. Here, the potential of plasma enhanced atomic layer deposition (PEALD) technique to develop uniform and 3D-conformal films on polycarbonate (PC) (Makrolon) planar and dome substrates has been explored. It enables to grow conformal Al2O3, TiO2 and SiO2 films on steeply curved PC substrates. Moreover, we demonstrate an 11-layer antireflection (AR) coating reaching about 0.2% reflection at 905 nm wavelength on the entire outer surface of several PC domes along with a consistent optical performance on the inner surface. The adhesion and environmental stability tests according to ISO-9211-04 resulted in promising adhesive and environmentally durable films on PC dome optics. These results suggest a possible way to grow uniform, dense, conformal, and stable optical coatings on sensitive polymer PC substrates for desired optical applications.
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