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Journal of the Optical Society of America B

Journal of the Optical Society of America B

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Early Posting

Accepted papers to appear in an upcoming issue

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March


(SLI) Two-dimensional models for optical vortices driven by gain media

  • Hyoung-In Lee and Jinsik Mok
  • received 01/06/2014; accepted 03/30/2014; posted 04/01/2014; Doc. ID 204221
  • [full text: PDF (690) KB)]
  • Abstract: The dynamics of a single particle moving on a flat plane is examined under the influence of state-dependent potentials. As a result, the electromagnetic Poyntingvector flows are captured for optical vortices driven by gain media. In particular, the signs of the coupling coefficients play a crucial role in establishing vortices. In this respect, the singularities related to vortices are resolved through backward time evolutions. Additional effects of the non-circular nature of quadratic potentials are illustrated through numerical simulations. In addition, the quantum mechanical reduction of our model features multipoles.

Keywords (OCIS):

  • (080.4865) Geometric optics : Optical vortices
  • (260.6042) Physical optics : Singular optics

Generation of picosecond pulsed coherent state superpositions

  • Ruifang Dong, Anders Tipsmark, Amine Laghaout, Leonid Krivitsky, Miroslav Jezek, and Ulrik Andersen
  • received 01/07/2014; accepted 03/28/2014; posted 03/28/2014; Doc. ID 203509
  • [full text: PDF (2273) KB)]
  • Abstract: We present the generation of approximated coherent state superpositions - referred to as Schr\"{o}dinger cat states - by the process of subtracting single photons from picosecond pulsed squeezed states of light. The squeezed vacuum states are produced by spontaneous parametric down-conversion (SPDC) in a periodically poled KTiOPO\subscript{4} crystal while the single photons are probabilistically subtracted using a beamsplitter and a single photon detector. The resulting states are fully characterized with time-resolved homodyne quantum state tomography. Varying the pump power of the SPDC, we generated different states which exhibit non-Gaussian behavior.

Keywords (OCIS):

  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes
  • (270.5570) Quantum optics : Quantum detectors
  • (270.6570) Quantum optics : Squeezed states
  • (250.1345) Optoelectronics : Avalanche photodiodes (APDs)
  • (270.5585) Quantum optics : Quantum information and processing

Quantum Information Splitting and Open-Destination Teleportation using Decomposable Multipartite Quantum Channel. Part 2: Experimental

  • Parminder Bhatia
  • received 12/20/2013; accepted 03/28/2014; posted 04/09/2014; Doc. ID 203488
  • [full text: PDF (359) KB)]
  • Abstract: Full detail of the experimental set-up required for implementing and verifying theoretical scheme for four-partite splitting and open-destination teleportation of an arbitrary two-qubit photonic state is discussed. In this experiment quantum channel is provided by a pair of decomposable generalized (G) Bell-states, which offer experimental advantage that they can be very easily generated in photonic experiments. Our experiment is based on generating two-qubit photonic state by ultra-fast spontaneous parametric down-conversion (SPDC) in nonlinear crystal and relies on Bell-state measurements, which in this experiment are performed by an optical Bell-state analyzer that can unambiguously determine all four Bell-states. In this experiment unitary transformation required at the destination station is implemented using quantum control NOT gate. We finally show that in our four-partite optical system two-qubit photonic state originally prepared at a sending station can be experimentally split and subsequently regenerated at any one of the three distinct receiving stations.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (320.2250) Ultrafast optics : Femtosecond phenomena
  • (270.5565) Quantum optics : Quantum communications
  • (270.5585) Quantum optics : Quantum information and processing

Selectively addressing optically non-linear nanocrystals by polarization shaped ultrafast laser pulses

  • Yuri Paskover, Dan Xie, François Laforge, and Herschel Rabitz
  • received 02/21/2014; accepted 03/26/2014; posted 03/28/2014; Doc. ID 206676
  • [full text: PDF (4441) KB)]
  • Abstract: A non-centrosymmetric nanocrystal can produce second-harmonic generation (SHG) and sum-frequency generation (SFG) upon interaction with a laser field. The SHG or SFG radiation depends on the orientation of the nanocrystal as well as the fifield polarization, which allows for modulating the second-order emission of an arbitrarily oriented nanocrystal by specially tailoring the fifield polarization. We theoretically study SHG and SFG signals produced by nanocrystals driven with broad-bandwidth laser pulses. Several simulations explore the influence of the field polarization and temporal pulse profifile. The latter two factors are decoupled in their influence upon the SHG and SFG signals, and thus polarization and temporal shaping can be independently performed to modulate a nanocrystals's second-order emission. We consider the possibility of enhancing (suppressing) the signal from one nanocrystal among others by choosing the appropriate polarization, thereby opening up the prospect of selectively addressing optically non-linear nanocrystals.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (190.2620) Nonlinear optics : Harmonic generation and mixing
  • (320.5540) Ultrafast optics : Pulse shaping
  • (160.4236) Materials : Nanomaterials

Dirac soliton stability and interaction in binary waveguide arrays

  • Truong Tran, Xuan Nguyen, and Dung Duong
  • received 02/06/2014; accepted 03/25/2014; posted 03/25/2014; Doc. ID 206068
  • [full text: PDF (371) KB)]
  • Abstract: We analyze the stability of a recently found exact analytical spatial soliton in binary waveguide arrays - an analogue of the relativistic Dirac soliton. We demonstrate that this soliton class is very robust. The soliton dynamics and different scenarios of soliton interactions are systematically investigated.

Keywords (OCIS):

  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (230.7370) Optical devices : Waveguides
  • (190.6135) Nonlinear optics : Spatial solitons

Initiating self-focusing of beams carrying spatial phase singularities

  • Alexander Dreischuh, Lyubomir Stoyanov, Georgi Maleshkov, and Ivan Stefanov
  • received 01/13/2014; accepted 03/25/2014; posted 03/26/2014; Doc. ID 204455
  • [full text: PDF (2294) KB)]
  • Abstract: In this work we show both experimentally and by numerical simulations that the presence and evolution of ring dark beam and/or on-axis optical vortex nested on a bright background beam noticeably perturb the host background. In a photorefractive nonlinear medium (crystal SBN) these perturbations can initiate self-focusing of the background. By changing the dark ring radius and the presence/absence of an optical vortex and keeping all other experimental parameters unchanged, we could relatively easily control the dynamics at the initial stage of longitudinal self-focusing and the type of self-focusing structure (single peak or bright ring of variable radius). The presented results may appear especially important in experiments involving cascaded nonlinear frequency mixing of singular beams, in which accelerated dark beam spreading is accompanied by self-focusing of certain portions of the perturbed host beam.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
  • (190.5330) Nonlinear optics : Photorefractive optics
  • (190.5940) Nonlinear optics : Self-action effects
  • (080.4865) Geometric optics : Optical vortices

Physical, chemical and optical properties of Er3+-doped low Al(PO3)3 /Al (H2PO4)3 modified fluoroaluminate glasses for 2.7 μm application

  • Feifei Huang, Weiwei Li, Lili Hu, and Danping Chen
  • received 02/13/2014; accepted 03/24/2014; posted 03/26/2014; Doc. ID 206425
  • [full text: PDF (1449) KB)]
  • Abstract: Novel fluoroaluminophosphate glasses with various content of metaphosphate Al(PO3)3 or dihydric phosphate Al(H2PO4)3 were prepared, respectively, to study the change in physical, chemical and optical properties of glasses for 2.7 μm application. The glass forming ability, thermal ability and structural properties were investigated along with the Judd-Ofelt parameters, absorption and emission cross sections were discussed based on the absorption and emission spectra. The glass forming ability and chemical stability ware enhanced with introducing metaphosphate (Al(PO3)3) or dihydric phosphate (Al(H2PO4)3) into the fluoroaluminate glass. The density decreased with the introduction of increased phosphate composition, while the refractive index increased. The absorption coefficient of OH- at about 3 μm dropped noticeably when Al(PO3)3 /Al (H2PO4)3 modified the fluoroaluminate glasses and an enhanced 2.7 μm emission was observed with an optimal content of phosphate composition. These results indicate that these fluoroaluminophosphate glasses with low metaphosphate Al(PO3)3 or dihydric phosphate Al(H2PO4)3 composition are promising candidates for 2.7 μm application.

Keywords (OCIS):

  • (140.0140) Lasers and laser optics : Lasers and laser optics
  • (140.3380) Lasers and laser optics : Laser materials
  • (260.0260) Physical optics : Physical optics
  • (260.2510) Physical optics : Fluorescence
  • (260.3060) Physical optics : Infrared
  • (300.6340) Spectroscopy : Spectroscopy, infrared

Thermal effects on bipartite and multipartite correlations in fiber coupled cavity arrays

  • Jian-Song Zhang and Ai-Xi Chen
  • received 01/14/2014; accepted 03/23/2014; posted 03/24/2014; Doc. ID 204416
  • [full text: PDF (349) KB)]
  • Abstract: We investigate the thermal influence of fibers on the dynamics of bipartite and multipartite correlations in fiber coupled cavity arrays where each cavity is resonantly coupled to a two-level atom. The atom-cavity systems connected by fibers can be considered as polaritonic qubits. We first derive a master equation to describe the evolution of the atom-cavity systems. The bipartite (multipartite) correlations is measured by concurrence and discord (spin squeezing). Then, we solve the master equation numerically and study the thermal effects on the concurrence, discord, and spin squeezing of qubits. On the one hand, at zero temperature, there are steady-state bipartite and multipartite correlations. One the other hand, the thermal fluctuations of a fiber may blockade the generation of entanglement of two qubits connected directly by the fiber while the discord can be generated and stored for a long time. This thermal-induced blockade effects of bipartite correlations may be useful for quantum information processing. The bipartite correlations of a longer chain of qubits is more robust than a shorter one in the presence of thermal fluctuations.

Keywords (OCIS):

  • (270.2500) Quantum optics : Fluctuations, relaxations, and noise
  • (270.5585) Quantum optics : Quantum information and processing

Wide-range and tunable diffraction management using two-dimensional rectangular lattice photonic crystals

  • Xulin Lin, Xiaogang Zhang, Kan Yao, and Xunya Jiang
  • received 12/10/2013; accepted 03/14/2014; posted 03/24/2014; Doc. ID 202803
  • [full text: PDF (2176) KB)]
  • Abstract: We propose that two-dimensional (2D) rectangular lattice photonic crystals composed of dielectric rods can be utilized for wide-range and tunable diffraction management. The control of diffraction for a normally incident beam is achieved by either properly choosing the operating frequency or changing the refractive index of the dielectric rods. The convergent, collimated and divergent beam behaviors corresponding to a wide range of diffraction are clearly illustrated using FDTD simulations. The tunability of diffraction around the frequency of super-collimation is also analyzed and demonstrated.

Keywords (OCIS):

  • (050.5298) Diffraction and gratings : Photonic crystals
  • (230.5298) Optical devices : Photonic crystals

Raman random laser in one-dimensional system

  • Alireza Bahrampour, Ehsan Shojaie, and Milad Sani
  • received 01/21/2014; accepted 03/08/2014; posted 04/15/2014; Doc. ID 205128
  • [full text: PDF (669) KB)]
  • Abstract: The probability of occurrence a resonance frequency of random cavities in the stokes bandwidth of the Raman active medium can causes Raman laser oscillation in Raman random structures. Due to the small bandwidth of Raman line shape, the probability of the simultaneous appearance of random cavity resonance frequencies in the cascade stokes line shapes is so small that the cascade Raman laser oscillation effects on the saturation behavior is negligible. Nonlinear transmission matrix method is employed to determine the statistical behavior of Raman random laser. Our results show that the statistical behavior depends on the position of stokes line shape relative to the center of stopband and edge of passband of the corresponding non-disorder system.

Keywords (OCIS):

  • (140.3460) Lasers and laser optics : Lasers
  • (190.5650) Nonlinear optics : Raman effect
  • (290.4210) Scattering : Multiple scattering

January


Modeling of temperature-dependent shift of photoluminescence peak of In(Ga)As quantum dots considering acoustic and optical phonons as two oscillators

  • Davoud Ghodsi Nahri and C. H. Ooi
  • received 10/30/2013; accepted 01/06/2014; posted 02/27/2014; Doc. ID 200325
  • [full text: PDF (777) KB)]
  • Abstract: We demonstrate that all the available experimental data of temperature (T)-dependent shift of photoluminescence (PL) peak of In(Ga)As quantum dots (QDs) can be fitted successfully by using two-oscillator model if and only if the whole temperature interval is divided to a few parts (at most four parts) depending on dispersion degree from a monotonic behavior. Analysis of the numerical results show that excitons mostly interact (inelastically) with acoustic (AC) or optical (OP) phonons separately. Increasing QDs uniformity, by using some growth techniques, results in removing the sigmoidal behavior, enhancing total AC phonon contribution, and the maximum temperature which AC phonons contribute to the T-dependent red shift of PL peak. Elevation of the number of monolayers (MLs) to a critical value about 1.6 results in enhancement of QD symmetry and total OP phonon contribution and decrease of QDs uniformity and total AC phonon contribution, while a rollover happens for further increase of the number of MLs. Therefore, we find that the highest QD symmetry correspond to this critical value of MLs, in accordance with previous results.

Keywords (OCIS):

  • (250.5230) Optoelectronics : Photoluminescence
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

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