OCommPHOTOPTICS 2016 Abstracts

Full Papers
Paper Nr: 1

Raman, Brillouin and Rayleigh Process in Distributed Optical Sensor


Amira Zrelli

Abstract: Optical fiber is an indispensable part of optic measurement sensor systems. Divers interactions between lights and fiber’ materials occur such as keer effect, linear and nonlinear process like Rayleigh, Raman and Brilllouin scattering. This paper treats the theory of distributed optical fiber sensing which can be used in many applications like monitoring of civil structures, Fire security, Aircraft, Oil and Gaz… We present a theoretical and simulation measurement of intensity in Raman and Brillouin process. We highlight the difference between ROTDR (Raman Optical Time Division Refectomertry) and BOTDR (Brillouin Optical Time Division Refectomertry).

Paper Nr: 2

Ultrafast All-Polymer Electrically Tunable Silicone Lenses


Michele Ghilardi, Herbert Shea, Samuel Rosset, Federico Carpi and Luc Maffli

Abstract: Dielectric elastomer actuators (DEA) are smart lightweight fl exible materials integrating actuation, sensing, and structural functions. The fi eld of DEAs has been progressing rapidly, with actuation strains of over 300% reported, and many application concepts demonstrated. However many DEAs are slow, exhibit large viscoelastic drift, and have short lifetimes, due principally to the use of acrylic elastomer membranes and carbon grease electrodes applied by hand. Here a DEA-driven tunable lens, the world’s fastest capable of holding a stable focal length, is presented. By using low-loss silicone elastomers rather than acrylics, a settling time shorter than 175 μs is obtained for a 20% change in focal length. The silicone-based lenses show a bandwidth 3 orders of magnitude higher compared to lenses of the same geometry fabricated from the acrylic elastomer. Stretchable electrodes, a carbon black and silicone composite, are precisely patterned by pad-printing and subsequently crosslinked, enabling strong adhesion to the elastomer and excellent resistance to abrasion. The lenses operate for over 400 million cycles without degradation, and show no change after more than two years of storage. This lens demonstrates the unmatched combination of strain, speed, and stability that DEAs can achieve, paving the way for complex fast soft machines.

Paper Nr: 3

Direct Observation of Optical Phase Conjugation using Counter-propagating Dual Pumped Four-wave Mixing in Semiconductor Optical Amplifier


Abhishek Anchal, Pradeep Kumar, Prince M Ananadarajah, Sean O'Duill and Pascal Landais

Abstract: We experimentally investigated the generation of phase-conjugated waves by counter-propagating dual pumped non-degenerate four-wave mixing in a semiconductor optical amplifier (SOA). The co-propagating signal and pump waves create a grating inside SOA which diffracts counter-propagating pump and generates the conjugate wave. Since the signal and conjugate waves appears at opposite ends, the conjugate is easily filtered out from the rest of spectrum with minimal spectral shift of the conjugate with respect to the incoming signal. With the pump powers of -3.2 dBm and signal input power of -7 dBm, we obtained conjugate of -27.2 dBm, giving a conversion efficiency of 1% at 12 GHz pump-signal detuning. We demonstrate phase conjugation by measuring intensity and phase of the electric fields of signal and conjugate waves. For phase measurement, we modulate the signal with a periodic pattern '1000' at 10 Gbps using a non-zero chirp Mach-Zehnder modulator.

Short Papers
Paper Nr: 6

Preparation of Photonic Crystals in Polymer Nanocomposites by Multi-beam Interference


Sandor Kokenyesi, Miklos Veres, Istvan Csarnovics, Burunkova Julia and Dmitrij Zhuk

Abstract: Increased applied interest to the fabrication of geometrical and optical patterns, photonic crystals and other elements of photonics stimulated our investigations on new functional light-sensitive materials and development of holographic methods for optical recording of two- and three-dimensional optical elements. In contrast to the number of known multi-step lithography, nanoimprint processes, we have developed the method of single-step recording of photonic crystals based on four-beam interference. This method was adjusted to the recording in acrylate nanocomposites and enabled the simple change of the periods and depth profiles of the resulting structures. Special polymer nanocomposites, based on acrylates and silica nanoparticles were used in this method. Enhancement of phase modulation due to the polymerization of the monomer matrix and redistribution of nanoparticles occurs in this media. Further enhancement of the recording parameters, changes of the polymerization processes and of the profile formation was realised in these nanocomposites due to the addition of gold nanoparticles, like it was published in [1,2]. AFM, SEM and micro-Raman profilings were used to establish the structure of the recorded photonic crystals. The role of the plasmon fields of the selectively excited gold nanoparticles with given dimensions in the recording process was investigated with aim to use optimum combination of matrix polymer, initiator and laser excitation parameters. This work was supported by Ministry of Education of Russian Federation project № 3.432.2014/K. References 1. J. Burunkova, I. Csarnovics, I. Denisyuk, L. Daróczi, S. Kökényesi, Journal of Non-Crystalline Solids 402 (2014) 200–203 2. J. Burunkova , S. Kokenyesi, I. Csarnovics , A. Bonyár , M. Veres, A. Csik, European Polymer Journal 64 (2015) 189–195.