Showing papers in "Optics Communications in 2009"

TL;DR: The proposed method combined with four differential chaotic systems and pixel shuffling can fully banish the outlines of the original image, disorders the distributive characteristics of RGB levels, and dramatically decreases the probability of exhaustive attacks.

TL;DR: In this article, the optical transmittance and photoluminescence spectra of both pure ZnO and Al-doped thin films have been studied, and the effect of substrate temperature on the crystallization behavior and optical properties of the films has been studied.

TL;DR: In this article, a method for the extraction of material parameters and thickness information from sub-100-μm thin samples using non-differential transmission terahertz time domain spectroscopy was proposed.

TL;DR: A novel method to encrypt a color image based on Arnold transform (ART) and interference method that encrypts each channel into two random phase masks based on the ART and interfered method is proposed.

TL;DR: In this paper, the binding energy and optical properties of one-electron quantum dot with and without an on-center impurity were investigated by assuming a spherically symmetric confining potential of finite depth.

TL;DR: It is shown that optical ZCC code can accommodate more users simultaneously for the typical error rate of optical communication system of 10 −9 and improves bit-error-rate performance as compared to the conventional coders.

TL;DR: In this article, the fabrication of low-loss amorphous silicon photonic wires deposited by plasma enhanced chemical vapor deposition was reported, which achieved propagation loss of 3.46 and 1.34 dB/cm for ridge waveguides.

TL;DR: Experimental analysis proved that the weak blind signature scheme based on the correlation of EPR (Einstein–Padolsky–Rosen) pairs have the characteristics of non-counterfeit, non-disavowal, blindness and traceability.

TL;DR: Experimental results show that the proposed approach can effectively improve the quality of the watermarked image and the robustness of the embedded watermark against various attacks.

TL;DR: The proposed FMF SPR biosensor has great potential for real-time analysis of immune reaction between biomolecules and the advantages of high-sensitivity and label-free detection.

TL;DR: In this paper, the authors theoretically investigated a hybrid absorptive-dispersive optical bistability and multistability behavior in a three-level V-type system using a microwave field driving a hyperfine transition between two upper excited states inside a unidirectional ring cavity.

TL;DR: Experimental results show that FSWM can provide better performance than other focus measures and methods and is compared with other multi-focus fusion methods such as Laplacian Pyramid and wavelet.

TL;DR: In this article, the authors demonstrate that porous fibers in addition to low loss and high confinement, have near zero dispersion for 0.5-1 THz resulting in reduced terahertz signal degradation compared to microwires.

TL;DR: The performance of a fragile watermarking method based on discrete cosine transform (DCT) has been improved in this paper by using intelligent optimization algorithms (IOA), namely genetic algorithm, differential evolution algorithm, clonal selection algorithm and particle swarm optimization algorithm.

TL;DR: In this article, a new type fiber bending sensor based on a tilted fiber Bragg grating (TFBG) interacting with a multimode fiber (MMF) is presented, which is formed by insertion of a small section of MMF between a singlemode fiber (SMF) and the TFBG.

TL;DR: In this paper, a combination of negative refraction and diffraction compensation in a superprism-based photonic crystal structure is used to demonstrate a compact on-chip photonic laser spectrometer.

TL;DR: A triple image encryption scheme by use of fractional Fourier transform is proposed, a multiple image algorithm is expanded and designed and all information of images is preserved in theory when image are decrypted with correct key.

TL;DR: In this multiparty quantum secret sharing scheme, all agents are not required to prepare entangled states or perform any local unitary operation, and the total efficiency of the scheme approaches to 100%.

TL;DR: A fast CW-THz imaging system in which a galvanometer is introduced to increase the imaging speed and make the beams reflected in different angles by vibrating at a certain frequency which can significantly decrease the image acquisition time.

TL;DR: In this paper, the authors proposed a variable fiber optical attenuator (VFOA) using an electronically controlled variable focus liquid lens, which uses the changes in the radius of curvature of the liquid lens edge to enable an electronically-controlled optical wedge that produces a varying beam tilt angle.

TL;DR: In this article, the least squares surface fitting with points number less than the matrix of the original hologram is performed on the unwrapped phase distribution to remove the unwanted wavefront curvature.

TL;DR: In this article, the optical and electrical properties of single layer and multilayer structures have been investigated as a function of the Ag and ITO film thicknesses, and the results showed that the maximum transmittance and sheet resistance values are mainly dependent on the Ag film thickness.

TL;DR: Numerical simulations of 10GBaud coherent quadrature phase-shift keying (QPSK) transmission show that the simplified NLEE can efficiently mitigate intra-channel nonlinearities.

TL;DR: A new experimentally feasible and secure quantum sealed-bid auction protocol using quantum secure direct communication based on GHZ states is proposed, and using this method guarantees the honesty of the protocol, and malicious bidders can not collude with the auctioneers.

TL;DR: In this article, the authors proposed to generate an optical vortex beam by using the coherent-superposition of multi-beams in a radially symmetric configuration in terms of the generalized Huygens-Fresnel diffraction integral.

TL;DR: In this article, the reconstruction properties of a Bessel-Gauss beam after an arbitrary obstruction were predicted by using the conical wave features of the Bessel Gauss beam, by considering the projection of the obstacle in space as a result of the travelling conical waves that produce the beam.

TL;DR: In this article, a temperature sensor based on microfiber knot resonator is proposed and demonstrated experimentally, which is placed on a plate glass substrate and coated with low-index polymer to keep the system robust.

TL;DR: In this paper, the effect of polarization-matched AlGaInN electron blocking layer and barrier layer on the optical performance of blue InGaN light-emitting diodes is numerically investigated.

TL;DR: In this article, a universal, Lorentz and gauge invariant measure of laser intensity was proposed and explicitly calculated for crossed field, plane wave and vortex models, and it can be used to model the relativistic motion of charges in strong electromagnetic fields.

TL;DR: In this article, the first experimental quantum optical coherence tomography images of a biological sample were presented in the form of 2D sections of different orientations, in which a quantum-entangled entity interacted with a biological specimen, generating a collection of quantum interferograms from which an image was constructed.