Andrey A. Machnev

Anomalous transmission of disordered arrays of silver nanoclusters in the near- and mid-IR regions

The results of studies of optical properties of single-layer and double-layer arrays of silver clusters separated by a ZnO film are presented. The arrays of clusters are fabricated via vacuum evaporation and subsequent annealing. All annealed samples exhibit both the surface plasmon resonance and the anomalous transmission effect in the near and middle IR regions.

Single-pass parametric generator made of DFB diodes, specialty-fiber amplifier, and periodically-poled lithium niobate

A compact pulsed mid-IR source with 10-ns pulsewidth, few hundred-microjoule energy, and repetition rate adjustable from 10 through 500 kHz is reported. In order to reach up to 30-% efficiency of down-conversion from 1064 nm to 1500/3500 nm, a 1064-nm narrow-line master oscillator is followed by a two-stage fiber amplifier. In turn, this amplifier is spliced with a large-mode-area photonic crystal fiber to ensure high quality of the beam that pumps a 5-mm thick periodically poled MgO-doped lithium niobate. The spectrum of the device replicates that of a cw 1500-nm seed laser.

Anomalous transmission of Ag/ZnO nanocomposites prepared by a magnetron sputtering

Single layer and double layer thin ZnO films with Ag nano-clusters on top and between them are fabricated by magnetron sputtering with subsequent annealing procedures. Transmission spectra measurements of the Ag/ZnO nanocomposite shows that a disordering (yet controllable) annealing modification, leads to a high transmission in the near- to the mid-IR spectral regimes. The spectra also show oscillations in the visible wavelength regime due to the excitation of surface plasmons that propagate along the surface of the nano-cluster. The behavior reported here is of interest for future implementation of new sub-wavelength, nanoplasmonic devices.

ZnO nanowire array grown on a fiber tip as a new platform for sensor and UV-laser application

The excitation of both surface polaritons and deep-level photoluminescence are observed and characterized in an array of ZnO nanowires with 40- to 50-nm diameter and 800-nm length that is being deposited on the end facet of a standard single-mode fiber.

Low-threshold supercontinuum generation for a gain-switched 1126-nm fiber laser

It has come to the attention of The Optical Society that this article should not have been submitted because: (1) not all co-authors had consented to its presentation; and (2) owing to its substantial replication, without appropriate attribution, of significant elements found in the previously published paper: A. V. Kiryanov, V. P. Minkovich, I. V. Mel’nikov, and A. B. Sotsky,

ZnO nanowires grown on a fiber tip and modified reflection

The surface polaritons localized at ZnO nanowires grown at a fiber tip are manifested as a distinct departure from Fabry-Perot type of effects in the reflection spectrum. The resonance shift offers deeper insight into multi-rod nanophotonic devices.

Compact mid-IR source based on a DFB diode, fiber amplifier, and PPLN

The PPLN crystal is combined with a set of DFB diodes and fiber amplifier to come up with a compact device that demonstrates high-stability output through near- to mid-IR range at repetition rate up to 500 kHz.

Kinetics of ZnO nanowire array grown on a fiber end face and reflection modification

The modification of the end-face reflection for a single-mode fiber is observed and that is due to an array of ZnO nanowires with 40- to 50-nm diameter and 1-micron length deposited there.