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Femtosecond laser-induced transfer, developed for the generation of metallic micro- and nanoparticles [1], is applied to the fabrication of Si nanoparticles. This method allows controllable fabrication of high quality spherical Si nanoparticles with radii of 50–300 nm. Measured light scattering spectra of individual Si nanoparticles demonstrate strong resonant responses in the visible and near-infrared...
Efficient coupling of nanoemitters to photonic or plasmonic structures requires control of the orientation of the emitting dipoles. Nevertheless control of the dipole orientation remains an experimental challenge. Many experiments rely on the realization of many samples, in order to be able to get one nanostructure coupled to a well aligned dipole. In order to avoid these statistical trials, the knowledge...
Diode-pumped passive Q-switched Nd: YVO4 microchip lasers are a simple low cost approach to generate optical pulses with high peak power and pulse durations below 100 ps [1] [2]. These lasers have a great potential for scientific and industrial applications. However the inherently large timing jitter of the interpulse period of the microchip laser may limit its applications, even if some relatively...
Waveguide lasers offer efficient and stable laser operation and their inherent properties enable low-loss fiber coupling. Hence they are promising radiation sources for on-chip integration in photonic micro-devices.
Lasers operating in the 2 micron wavelength region are of particular interest for various applications in remote sensing/LIDAR, materials processing, and medical treatments. Thulium-doped media have several attractive features for generating light in this wavelength band, including a broad emission bandwidth, long-lived metastable states, absorption bands matched to high-power 0.8 mm diode-pump sources...
Efficient creation of excitons in organic solar cells requires a large optical path of light through the active material. However, organic cells feature very low charge mobility requiring very thin active layers around one hundred nanometers. To increase light matter-interactions in thin polymers, metallic particles or nanostructuration have been proposed to scatter impinging light into the polymer...
The spectral response of metallic nanoparticles is dominated by the Localized Surface Plasmon Resonance (LSPR). While its spectral position is well understood, measuring and interpreting the LSPR linewidth evolution with shape and size is still an important issue for both fundamental investigations and applications. It needs the use of single particle experiments on nanoparticles with a well controlled...
Electric and magnetic dipolar and quadrupolar Mie resonances in high index dielectric particles exhibit high quality factor that compensate their low field confinement compared to the plasmon resonances of metallic particles [1]. In a host matrix of refractive index n = 1.45, and when a dipolar electric or magnetic emitter is placed at the center of a dimer of Si spheres, we obtain enhancement factors...
Surface acoustic waves (SAWs) have proven a useful tool for dynamically manipulating the optical properties of semiconductor nanostructures [1,2]. Recently we have shown that the mechanical deformation induced by a SAW on a two-dimensional photonic crystal membrane (PCM) spectrally tunes the resonance frequency of nanocavities within the PCM employing phase locked stroboscopic excitation [3].
Experimental studies of the atom-surface or surface-surface interactions provide a physical insight on the interaction of quantum bodies with the fluctuating vacuum. They can be of great practical interest in the ever expanding field of nanotechnologies. In particular the dependence of the Casimir and Casimir-Polder interaction on the thermal fluctuations is a fundamental effect that could in the...
Microwave photonics (MWP) merges optical components and subsystems with RF engineering. As an emerging technology, it enables realization of complex RF functionalities beyond the capability of the current all-electronics systems. In the investigations of the recent decades, the advantages of MWP systems such as large instantaneous bandwidth, RF frequency transparency, flexible tunability and reconfigurability,...
The efficient design of optical communication systems with advanced modulation formats need of an exhaustive mathematical study in order to completely understand the dynamics and design trade-offs involved [1]. The multi-carrier signal's nature of OOFDM signals and the inclusion of the laser chirp into the propagation through a dispersive link makes its rigorous analysis quite challenging, though...
Long-period fibre grating (LPFG) is an attractive fibre device that is useful in applications such as gain-flattening filters and fibre-optic sensors, because of low background reflection and easy-to-form large grating period [1]. However, the wavelength-selective loss is generally determined by the fabrication process, e.g., UV laser exposure, and can hardly be tuned later. Therefore the applications...
Future high capacity wavelength division multiplexed (WDM) optical networks will rely on transmitting signals with information encoded on both the amplitude and phase of multiple optical carriers. To optimise the efficiency of these networks, they are likely to employ some level of wavelength switching [1], and a key function required by wavelength switching is wavelength conversion [1]. Wavelength...
We show experimentally that bistable, optically-induced phase switching in germanium antimony telluride (GST) — a member of the Te-based chalcogenide alloy family upon which all of today's re-writable optical disc and phase-change RAM technologies are based — provides a platform for the engineering of non-volatile metamaterial transmission/reflection modulators (Fig. 1) for near- to mid-infrared wavelengths...
Wavelength conversion via four-wave mixing (FWM) schemes of high-bit rate data formats are conventionally achieved using a strong pump source and a secondary nonlinear device, such as highly nonlinear fibre [1] or semiconductor optical amplifier [2]. In this work we obviate the need for a secondary nonlinear device, and achieve wavelength-conversion of high repetition-rate pulse trains by externally...
Many types of all-optical header processing techniques have been investigated to speed up telecommunication networks. High-speed label switching using a multimode interference bistable laser diode has been demonstrated for 1-bit header [1]. We have investigated the all-optical buffer memory which memorizes an arbitrary one bit from optical signal trains using AND gate and memory functionalities of...
All-optical control of the state-of-polarization (SOP) of light using nonlinear effects in optical fibers has attracted much research interest in recent years [1-3]. These efforts are motivated by telecom applications requiring high-precision polarization control without adding polarization-dependent losses, as in conventional polarizing devices. Nonlinear polarization pulling has already been demonstrated...
Excitability is a well-established nonlinear dynamical concept in biological (neurons), and chemical (Belousov-Zhabotinsky reaction) systems [1]. The all-or-none response of an excitable system is a key effect of information processing in excitable oscillators. Excitability has been reported in lasers with promising applications in photonics such as clock recovery and pulse reshaping [2]. However,...
Optical injection in passively mode-locked (ML) semi-conductor lasers has been extensively studied for a variety of applications, the synchronization (or the so-called all-optical clock-recovery (ORC)) being among the most attractive uses for optical time division multiplexed networks. In recent studies, quantum-dash (QDash) Fabry-Perot (FP) semiconductor lasers have shown to be good candidates for...
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