Showing papers in "Optics Communications in 2007"

TL;DR: An image encryption algorithm to simultaneously encrypt two images into a single one as the amplitudes of fractional Fourier transform with different orders is presented, independent of additional random phases as the encryption/ decryption keys.

TL;DR: In this article, the concept of a kind of complex grating based on superposition of two simple binary gratings is described for potential application as thermophotovoltaic (TPV) radiators.

TL;DR: In this paper, the authors proposed a chaotic signal generation and cancellation system using an all fiber optic scheme, which consists of a standard diode laser, a fiber optic micro ring resonator, and an optical add/drop multiplexer.

TL;DR: The third-order nonlinear optical and optical limiting properties of 2,3,9,10,16,17,23,24,24-octakis-(heptyloxy)-phthalocyanine, 2.3, 9, 10, 16, 17, 23, 24, 24 octakis-hexagonal phthalocyanin zinc(II) (symmetric) and 2(3)-(butane-1,4-dioic acid)-9(10),16(17),23(24)-tri tert-butyl ph

TL;DR: The technique is shown to be a powerful one for colored text encryption and its sensitiveness to changes in the fractional order during decryption is examined.

TL;DR: In this article, the core and cladding modes exhibit different thermal sensivities, while the strain sensivities are approximately equal, while monitoring the core-core mode coupling resonance and the corecladding modes coupling resonance of the TFBG spectrum allows the separation of the temperature and strain induced wavelength shifts.

TL;DR: Several aspects such as noise reduction, filtering and encryption in the gyrator domains are discussed, which can be performed by numerical calculations or by an appropriate optical set up.

TL;DR: In this article, the third-order nonlinear optical response of a triphenylmethane dye (Acid blue 7) was studied using the Z-scan technique with a continuous-wave He-Ne laser radiation at 633-nm.

TL;DR: In this article, a general study of transverse energy flows (TEF) as physically meaningful and informative characteristics of paraxial light beams' spatial structure is presented, where the total TEF can be decomposed into the spin and orbital contributions giving rise to the spin angular momentums, correspondingly.

TL;DR: An optimization procedure based on the Fisher information metric is employed to obtain the optimum values of the parameters for the exponential and the cubic masks, respectively, and shows that the exponential phase mask provide slight advantage to the cubic one in several aspects.

TL;DR: In this article, the axial and transverse components of the electric field interacting through the nonlinear susceptibility χ (2) tensor were used to explain second harmonic generation microscopy images of rat tail tendons.

TL;DR: In this paper, it was shown that large negative Goos-Hanchen (GH) shifts can be expected in the case of weak absorption at incidence close to the Brewster angle.

TL;DR: In this article, a graphical approach with signal flow graph is employed for the analytical derivation of the optical transfer functions in Z-domain of filters, including the transmittance and group delay of the drop port with respect to the input port.

TL;DR: In this paper, an extrinsic fiber Fabry-Perot interferometer (EFPI) sensor was proposed for pressure measurement with low sensitivity variation, and the experimental pressure sensitivity for EFPI and fiber Bragg grating (FBG) sensors were measured.

TL;DR: In this paper, a new technique is proposed for generating a tight dark focal spot surrounded by uniform light intensity in all directions, based on a single focusing lens illuminated from one side, hence the alignment sensitivities associated with 4π methods are eliminated.

TL;DR: In this paper, it is shown that radial polarization leads to the best light beam focalisation in terms of spot size, whereas circular polarization induces best light confinements in air, whereas for numerical apertures beyond 8, radial polarization seems the right solution.

TL;DR: In this article, the authors analyzed the optical bistability behavior of an asymmetric coupled-quantum well (CQW) driven coherently by a probe laser field and a control laser field by means of a unidirectional ring cavity.

TL;DR: In this article, a theoretical analysis is carried out to estimate the sensitivity and the signal-to-noise ratio (SNR) of a fiber optic surface plasmon resonance (SPR) sensor when fibers with different dopants and different doping concentrations are used.

TL;DR: In this article, an optically pumped continuous wave potassium vapor laser operating in a single longitudinal and a single transverse mode at 770 nm was presented, where the measured value of the input power to the output power slope efficiency was 20%.

TL;DR: In this article, the propagation properties of an off-axis Gaussian Schell model (GSM) beam in a turbulent atmosphere were investigated based on the extended Huygens-Fresnel integral formula.

TL;DR: In this article, a three-party scheme for probabilistically implementing quantum state sharing of an arbitrary unknown two-qubit state by using two non-maximally entangled three-qubits states as the quantum channel is presented.

TL;DR: In this article, the authors examined the roles played by the slit apertures, such as length, depth, period and number of slits, in the transmission of polarized light through subwavelength slit arrays in visible and near infrared range wavelengths.

TL;DR: In this article, the nonlinear responses and optical limiting performance of a dye type acid, called fast green FCF, are investigated under irradiation of 35mW continuous wave He-Ne Laser.

TL;DR: In this article, the authors observed phase-matched third-harmonic generation at 355nm in a low-order mode of a sub-micron diameter glass fiber, and the thirdharmonic signal exhibits a sharp resonance for a fiber diameter d = 0.49 ± 0.02μm.

TL;DR: In this article, the synthesis and characterization of a new dioxime ligand, (H2L), (III) and its trinuclear copper(II) complex, [Cu3L2(H2O)2](ClO4)2, (V) is described.

TL;DR: In this paper, the authors studied the change in the degree of coherence of partially coherent electromagnetic beam (so called electromagnetic Gaussian Schell-model beam) under a particular atmospheric turbulence model.

TL;DR: In this article, a theoretical analysis of the three-, four-and five-photon absorption process using the open aperture Z-scan technique is presented, where the normalized transmittance equations presented here can be used to fit the experimental data, allowing the determination of material's multiphoton absorption cross-section.

TL;DR: In this article, the temperature effects on the emission and fluorescence lifetime of ytterbium-doped optical fibers are investigated, and from these the temperature dependent emission and absorption cross-sections are calculated.

TL;DR: In this paper, a novel terahertz wave modulator based on a silicon oxide/polyaniline photonic crystal is proposed, which is based on the dynamic shift of the photonic band gap by the applied external electric field.

TL;DR: In this article, the effect of erbium dopant on structural, morphological, luminescent and nonlinear optical properties was studied using spray pyrolysis technique.