A simple multi-wavelength passively Q-switched Erbium-doped fiber laser (EDFL) is demonstrated using low cost multi-walled carbon nanotubes (MWCNTs) based saturable absorber (SA), which is prepared using polyvinyl alcohol (PVA) as a host polymer. The multi-wavelength operation is achieved based on nonlinear polarization rotation (NPR) effect by incorporating 50 m long photonic crystal fiber (PC...

A high-thrust screw-type piezoelectric ultrasonic motor with a three-wavelength exciting mode is proposed in this paper. The motor mainly includes a stator and a screw output shaft, and the stator is composed of twelve rectangular piezoelectric plates and a hollow metal elastomer with an internal thread. The stator can be excited to generate the combined micro ultrasonic vibration mode. With th...

GaInN/GaN multiple quantum well light-emitting diode structures in polar c-axis and non-polar m-axis growth have been compared in terms of luminescence properties. Grown under identical conditions, under low excitation density the c-axis structure has a luminescence maximum at 558nmwhile the maxis structure shows a maximum at 488nm and shows superluminescence at 485nm under high photoexcitation...

The paper investigates the QoS performance with service differentiation of the wavelength-routed optical burst switched (WR-OBS) network architecture. The request scheduler was analysed as the means of the QoS provisioning and impact of the request scheduling on the QoS performance was investigated in terms of the burst blocking probability and burst end-to-end delays. The WROBS QoS performance...

We study experimentally and numerically electrical and optical methods to switch the lasing wavelength in a linear multi-cavity laser. The electrical method uses radio frequency modulation of the gain region to modify effective optical loss at a well-defined wavelength. The optical method uses injection of lasing light to modify effective photon lifetime at the injection wave-length. Short tran...

In this report, gold nanorods (GNRs) were used to enhance the sensitivity of the wavelength-modulated surface plasmon resonance (SPR) biosensor. The GNRs were designed and fabricated through seed-medicated growth and surface activation by a layer of a weak polyelectrolyte, poly(acrylic acid) for the attaching antibody. Rabbit anti-goat IgG was immobilized on GNRs, and sandwich assays were carri...

This study presents the modelling, simulation, and characterization of the Fiber Bragg grating (FBG) on maximum reflectivity, bandwidth, the effect of applied strain to the wavelength shift, ŽB and sensitivity of the wavelength shift with strain for optical sensing system. In this study, a commercial FBG with the center wavelength of 1550nm is used in order to measure the spectral response of F...

We explore the passive optical sorting of plasmon nanoparticles and investigate the optimal wavelength and optimal beam shape of incident field. The condition for optimal wavelength is found by maximising the nanoparticle separation whilst minimising the temperature increase in the system. We then use the force optical eigenmode (FOEi) method to find the beam shape of incident electromagnetic f...

Many adaptive optics systems operate by measuring the distortion of the wavefront in one wavelength range and performing the scientific observations in a second, different wavelength range. One common technique is to measure wavefront distortions at wavelengths <∼1 μm while operating the science instrument at wavelengths>∼ 1 μm. The index of refraction of air decreases sharply from shorter visi...

The far-zone behavior of polychromatic light waves on scattering from an anisotrophic semi-soft boundary medium with spectral dependence was considered, and the density degree coherence scattered field were investigated. It is shown that distributions are closely related rms width, center wavelength, maximum value wavelength potential medium.