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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

OSA now posts prepublication articles as soon as they are accepted and cleared for production. See the FAQ for additional information.

<< Previous Page Articles 41 to 45 of 45

January


Protecting the precision of estimation in a photonic crystal

  • Kamal Berrada
  • received 09/25/2014; accepted 01/26/2015; posted 02/04/2015; Doc. ID 223094
  • [full text: PDF (298) KB)]
  • Abstract: The quantum Fisher Information (QFI) of a two-level atom in an anisotropic and isotropic photonic band-gab (PBG) crystal has been studied without Born or Markovian approximation. We show that the precision of the parameter estimation for the two-level atom in the photonic crystal is greatly different from that of a two-level atom in vacuum or that subjected to the usual non-Markovian reservoir. The phenomenon that the QFI, namely, the precision of estimation, changes dramatically with the environment structure. The results also show that, for PBG materials as environment high values of QFI trapping can be achieved and thus prevention of QFI sudden drop occur, which seriously enhances the coherence and increases the precision of estimation. Moreover, The QFI in the isotropic PBG is more easily preserved than that in the anisotropic PBG under the same condition. These features make the atom system in PBG materials as a good candidate for implementation of different schemes of quantum optics and information with highly precision.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.4400) Nonlinear optics : Nonlinear optics, materials
  • (270.0270) Quantum optics : Quantum optics
  • (270.5570) Quantum optics : Quantum detectors
  • (270.5585) Quantum optics : Quantum information and processing

Model of Third Harmonic Generation and Electric Field Induced Optical Second Harmonic Using Simplified Bond-Hyperpolarizability Model

  • Adalberto Alejo-Molina, Kurt Hingerl, and Hendradi Hardhienata
  • received 01/13/2015; accepted 01/24/2015; posted 02/06/2015; Doc. ID 232436
  • [full text: PDF (1295) KB)]
  • Abstract: We report for the first time a comprehensive study of the fourth rank tensor describing third harmonic generation (THG) and electric field induced second harmonic (EFISH) in centrosymmetric material from two different viewpoints: Group Theory (GT) and the Simplified Bond Hyperpolarizability Model (SBHM). We show that the fourth rank tensor related to THG and direct current (DC) EFISH can be reduced to two independent elements whereas SBHM always gives only one, reproducing perfectly well EFISH experimental results in Metal Oxyde Semiconductor (MOS). We argue that it is possible to reduce the fourth rank tensor describing EFISH to a third rank tensor and further deliver a classical explanation of EFISH regarding symmetry breaking where the term containing $r^3$ in the potential immediately leads to second harmonic generation (SHG).

Keywords (OCIS):

  • (000.6800) General : Theoretical physics
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.2620) Nonlinear optics : Harmonic generation and mixing

Interface Modes for Monolithic Nonlinear Photonics

  • Amr Helmy, Junbo Han, Payam Abolghasem, and Arghavan Arjmand
  • received 11/28/2014; accepted 01/22/2015; posted 01/22/2015; Doc. ID 228725
  • [full text: PDF (1065) KB)]
  • Abstract: A design methodology for obtaining versatile interface modes in monolithic structures is discussed. These modes are then utilized in conjunction with total internal reflection modes for phase-matching second-harmonic generation in periodic layered media in AlxGa1-xAs material system. Typical loss values of 2:71 cm-1 for TE and 4:26 cm-1 for TM-polarized pump around 1550 nm were obtained. Nonlinear characterizations are carried out using 2-ps, 30-ps and continuous-wave pump for type-I and type-II interactions. Maximum SHG conversion efficiency of 1:14104 %W-1cm-2 is observed for type-II process with a pump power of 0.52 mW in a sample with a length of 2.0 mm.

Keywords (OCIS):

  • (190.4390) Nonlinear optics : Nonlinear optics, integrated optics
  • (190.4400) Nonlinear optics : Nonlinear optics, materials
  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes
  • (240.1485) Optics at surfaces : Buried interfaces
  • (130.7405) Integrated optics : Wavelength conversion devices

(OCT2014) Optical collimation of an atomic beam using a white light molasses

  • Rohan Glover and Thierry Bastin
  • received 11/04/2014; accepted 01/02/2015; posted 01/16/2015; Doc. ID 226250
  • [full text: PDF (1739) KB)]
  • Abstract: We investigate optical collimation of an atomic beam using a spectrally broadened `white light molasses'. We compare this technique with the standard technique using an atomic collimator and find that under certain conditions the white light molasses is preferable. Specifically, a white light molasses is suitable for atomic beams with relatively low mean velocities and broad velocity distributions, for example a beam effusing from a cryogenically cooled reservoir. This result is demonstrated by numerically modeling the atomic trajectories of argon atoms effusing from a cryogenically cooled reservoir. We find that given sufficient power a white light molasses captures a larger fraction of atoms when compared to an atomic collimator and the velocity distribution of the resulting beam is shifted towards slower velocities. Further, an optical molasses is geometrically relatively simple compared to an atomic collimator and therefore the complexity of the in vacuum optical arrangement can be significantly reduced.

Keywords (OCIS):

  • (000.2170) General : Equipment and techniques
  • (020.0020) Atomic and molecular physics : Atomic and molecular physics
  • (020.3320) Atomic and molecular physics : Laser cooling

December


Comment on “Elliptic cylindrical pseudo-optical black hole for omnidirectional light absorber”

  • Alexander Kildishev, Ludmila Prokopeva, and Evgenii Narimanov
  • received 11/20/2014; accepted 12/09/2014; posted 12/15/2014; Doc. ID 228243
  • [full text: PDF (2995) KB)]
  • Abstract: We prove that Lee’s et al. theoretical analysis and a final formula for ray trajectories in an elliptic cylindrical optical ‘black hole’ are incorrect. By utilizing a full wave finite-element simulation we show that a non-paraxial Gaussian beam does not follow a trajectory obtained using their recipe.

Keywords (OCIS):

  • (260.0260) Physical optics : Physical optics
  • (350.6980) Other areas of optics : Transforms
  • (080.4295) Geometric optics : Nonimaging optical systems
  • (080.5692) Geometric optics : Ray trajectories in inhomogeneous media
  • (260.2710) Physical optics : Inhomogeneous optical media

<< Previous Page Articles 41 to 45 of 45





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