We report the formation of arbitrary photoconductive patterns made of tellurium (Te) nanocrystals by exposing a tellurite (TeO2-based) glass to femtosecond laser pulses. During this process, Te/TeO2-glass nanocomposite interfaces with photoconductive properties form on the tellurite glass substrate. We show that these laser-written patterns have a highly reproducible photo-response, from the near ultraviolet (263 nm) to the visible spectrum, stable over a few months. Specifically, high responsivity (16.55 A/W) and detectivity (5.25*10^11 Jones) of a single laser-written line pattern are measured for an illumination dose of 0.07 mW/cm^2 at 400 nm. This work illustrates a pathway for locally turning a tellurite glass into functional photoconductor of arbitrary shape, without adding materials and using a single laser process step.

Compact planar photonic elements serving for efficient control over the polarization of light are of paramount importance in photonics. Here, we propose a design of a chiral periodic metasurface based on plasmonic nanodisks and nanorods arranged asymmetrically in a unit cell. Using the finite-difference time-domain analysis, we show that the collective lattice resonance harnessed by the diffraction coupling of the plasmonic unit cells is the heart of the revealed resonant 38% circular dichroism effect. The circular dichroism enhancement of the considered structure is improved using the deep-learning-assisted optimization of the metasurface design.

Plasmonic crystals are an important backbone of modern photonics offering versatile control of light via manipulation of surface plasmon polaritons (SPPs). In particular, they sustain resonant light localization near the metal surface resulting in the enhancement of magneto-optical effects and nonlinear optical phenomena, the bridge of which is appealing for sensing and light routing. In this work we investigate the resonant SPP-driven enhancement of the transverse magneto-optical Kerr effect and the second harmonic generation under the conical diffraction of light in a one-dimensional magnetoplasmonic crystal (MPC) based on the combination of gold and ferromagnetic permalloy films. We demonstrate an extra way for the control over the magneto-optical effects in the MPC via the magnetic anisotropy of corrugated ferromagnetic film in the structure of the MPC.

Magneto-optical effects in metal–dielectric nanostructured materials based on opal films coated with a thin cobalt/silver nanolayer, whose surface has a close-packed hexagonal lattice of metal nanohemispheres and nanoholes, have been investigated. It has been demonstrated experimentally and theoretically that a wide spectrum of modes of propagating surface plasmon polaritons is excited in such a system, which leads to a resonant enhancement of the magneto-optical effect in the Voigt geometry.

Resonant optical properties of the magnetoplasmonic crystals, which support propagation of surface plasmon polaritons (SPPs) accompanied by magnetooptical effects, have found success in magnetic field driven control of optical radiation. In this work we investigate the resonant magnetooptical effects in the second harmonic generation in the magnetoplasmonic crystal formed by gold/pemalloy bifilm covering dielectric grating. Strong transverse magnetooptical Kerr with the contrast up to 30% is revealed in the spectral vicinity of the SPP excitation.

Исследованы магнитооптические эффекты в металл-диэлектрических наноструктурированных материалах на основе пленок опала, покрытых тонкой пленкой кобальт/серебро, поверхность которых представляет собой плотноупакованные гексагональные решетки металлических нанополусфер и наноотверстий. Экспериментально и теоретически показано, что в такой системе возбуждается широкий спектр мод бегущих поверхностных плазмон-поляритонов, что приводит к резонансному усилению магнитооптического эффекта в геометрии Войта.

Hyperbolic metamaterials (HMM) based on multilayered metal/dielectric films or ordered arrays of metal nanorods in a dielectric matrix are extremely attractive optical materials for manipulating over the parameters of the light flow. One of the most promising tools for tuning the optical properties of metamaterials in situ is the application of an external magnetic field. However, for the case of HMM based on the ordered arrays of magneto-plasmonic nanostructures, this effect has not been clearly demonstrated until now. In this paper, we present the results of synthesis of HMM based on the highly-ordered arrays of bisegmented Au/Ni nanorods in porous anodic alumina templates and a detailed study of their optical and magneto-optical properties. Distinct enhancement of the magneto-optical (MO) effects along with their sign reversal is observed in the spectral vicinity of epsilon-near-zero and epsilon-near-pole spectral regions. The underlying mechanism is the amplification of the MO polarization plane rotation initiated by Ni segments followed by the light propagation in a strongly birefringent HMM. This stays in agreement with the phenomenological description and relevant numerical calculations.

Optical and magneto-optical spectroscopy methods are used to study the properties of one-dimensional spatially-periodic structures formed by a dielectric grating covered with gold and permalloy films. We demonstrate that such structures reveal surface plasmon-polariton excitation with the resonant frequency that can be controlled by the geometry of the experiment. Modulation of the magneto-optical Kerr effect is attained in the spectral vicinity of the plasmon resonance, which is absent for the case of non-structured gold-Py bilayer.

Properties of one-dimensional spatially periodic metal structures formed by a dielectric lattice covered by gold and permalloy films are studied by optical and magnetooptical spectroscopy techniques. It is shown that these structures reveal the excitation of surface plasmon-polaritons, with the resonance frequency that can be controlled by the geometry of the experiment. The magnetooptical Kerr effect modulation, which is absent in the case of a nonprofiled gold/permalloy bifilm, is observed in the spectral vicinity of the plasmon resonance.