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Journal of the Optical Society of America A

Journal of the Optical Society of America A

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August


Comparison of the rigorous coupled-wave approach and the finite element method for photovoltaic devices with a periodically corrugated metallic backreflector

  • Manuel Solano, Muhammad Faryad, Akhlesh Lakhtakia, and Peter Monk
  • received 06/25/2014; accepted 08/25/2014; posted 08/25/2014; Doc. ID 214651
  • [full text: PDF (453) KB)]
  • Abstract: Optimal design of photovoltaic devices with a periodically corrugated metallic back\-reflector requires a rapid and reliable way to simulate the optical characteristics for wide ranges of wavelength and angle of incidence. Two independent numerical techniques are needed for confidence in numerical results. We compared the rigorous coupled-wave approach (RCWA) and the finite element method (FEM), the former being fast and flexible, but the latter having predictable convergence even for discontinuous constitutive properties. Depending on the shape of the corrugation and the constitutive properties of the metal and dielectric materials making up the device, both methods can exhibit slow convergence rates for p-polarized light. The chosen model problem in this paper is of this type. As rapid spatial variations of the fields are the underlying cause, suitable selective refinement of the FEM mesh can overcome this slow convergence. Therefore, it would be desirable to have a self-adaptive scheme for choosing the mesh in the FEM. This will slow down the algorithm, but will give a reliable way to check the RCWA results.

Keywords (OCIS):

  • (050.1950) Diffraction and gratings : Diffraction gratings
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods
  • (050.5298) Diffraction and gratings : Photonic crystals

Tailorable optical scattering properties of the V-shaped plasmonic nano-antennas: a computationally efficient and fast analysis

  • M. Chryssomallis, D. Anagnostou, and Arash Rashidi
  • received 06/11/2014; accepted 08/25/2014; posted 08/26/2014; Doc. ID 213914
  • [full text: PDF (1065) KB)]
  • Abstract: We introduce an efficient computational scheme based on Macro Basis Function (MBF) method, to analyze the scattering of a plane wave by the V-shaped plasmonic optical nano-antennas. The polarization currents and the scattered fields for symmetric and anti-symmetric excitations are investigated. We investigate how the resonant frequency of the plasmonic V-shaped nanoantenna is tailored by engineering the geometrical parameters and by changing the polarization state of the incident plane wave. The computational model presented herein is faster by orders of magnitude than commercially available finite methods and is capable to characterize also other nano-antennas comprising of junctions and bends of nanorods.

Keywords (OCIS):

  • (290.0290) Scattering : Scattering
  • (160.3918) Materials : Metamaterials
  • (250.5403) Optoelectronics : Plasmonics

FDTD-Based Quantitative Analysis of Terahertz Wave Detection for Multilayered Structures

  • Wanli Tu, Shuncong Zhong, Yao-Chun Shen, Qing Zhou, and Ligang Yao
  • received 07/03/2014; accepted 08/25/2014; posted 08/27/2014; Doc. ID 215285
  • [full text: PDF (873) KB)]
  • Abstract: Experimental investigations have shown that terahertz pulsed imaging (TPI) is able to quantitatively characterise a range of multilayered media (e.g., biological issues, pharmaceutical tablet coatings, layered polymer composites, etc.). Advanced modelling of the interaction of terahertz radiation with a multilayered medium is required to enable the wide application of THz technology in a number of emerging fields, including non-destructive testing. Indeed, there have already been many theoretical analyses performed on the propagation of terahertz radiation in various multilayered media. However, to date, most of these studies used one-dimensional or two-dimensional models, and the dispersive nature of the dielectric layers was not considered or was simplified. In the present work, the theoretical framework of using terahertz waves for the quantitative characterisation of multilayered media was established. A three-dimensional (3D) model based on finite difference time domain(FDTD) method is proposed. A batch of pharmaceutical tablets with a single coating layer of different coating thicknesses and different refractive indices was modelled. The reflected THz wave from such a sample was computed using the FDTD method, assuming that the incident THz wave is broad-band, covering a frequency range up to 3.5THz.The simulated results for all of the pharmaceutical coated tablets considered were found to be in good agreement with the experimental results obtained using a commercial TPI system. In addition, we also studied a three-layered medium to mimic the occurrence of defects in the sample.

Keywords (OCIS):

  • (120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
  • (080.1753) Geometric optics : Computation methods
  • (110.6795) Imaging systems : Terahertz imaging

Theoretical analysis and applications on nano-block loaded rectangular ring

  • Shiping Zhan, Hongjian Li, Guangtao Cao, Zhihui He, Boxun Li, and Hui Xu
  • received 06/27/2014; accepted 08/22/2014; posted 08/25/2014; Doc. ID 214835
  • [full text: PDF (404) KB)]
  • Abstract: We propose compact and switchable optical filters based on the nano-blocks loaded rectangular rings, and investigate the selecting property numerically and theoretically. A simple and convenient phase model is established for the theoretical analysis. The dependent factors, such as the number, size and positions of the loaded blocks, are discussed in details. It is found that longer wavelength can be obtained without increasing the device dimension, and the selected wave is more sensitive to length of the loaded blocks. The loading positions play key roles for the realization of separating the second order modes. Finally, applications of this proposed structure are simply discussed. We find that the loaded filter device guarantees a more compact size than the unloaded one on same property, and a tunable plasmon induced transparency (PIT) based switch effect is also achieved. These findings suggest potential applications in compact filter, tunable slow light devices and sensor field

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (230.7370) Optical devices : Waveguides
  • (250.5403) Optoelectronics : Plasmonics
  • (230.7408) Optical devices : Wavelength filtering devices

Invisibility assessment: a visual perception approach

  • Ivan Moreno, Yessenia Jauregui-Sánchez, and Maximino Avendaño Alejo
  • received 03/18/2014; accepted 08/22/2014; posted 08/25/2014; Doc. ID 208362
  • [full text: PDF (1839) KB)]
  • Abstract: Determining how invisible an optical cloak intended to hide something is becoming a real problem in recent times. There are many invisibility mechanisms, the performance is quite different from technique to technique, and it is desirable to have a precise metric for their comparison. Here we propose a simple metric that assesses the invisibility in a similar way as humans do. This invisibility index is based on the fact that the human visual system (HVS) is highly sensitive to spatial frequencies, and then uses the Fourier transform and the contrast sensitivity function of the HVS to assess invisibility.

Keywords (OCIS):

  • (070.0070) Fourier optics and signal processing : Fourier optics and signal processing
  • (330.5000) Vision, color, and visual optics : Vision - patterns and recognition
  • (100.4995) Image processing : Pattern recognition, metrics
  • (230.3205) Optical devices : Invisibility cloaks

Experimental study of spatial coherence diffraction based on full-field coherence visualization

  • Juan Zhao and Wei Wang
  • received 04/17/2014; accepted 08/22/2014; posted 08/25/2014; Doc. ID 210258
  • [full text: PDF (704) KB)]
  • Abstract: A novel optical geometry for the direct visualization of optical coherence function is proposed. The diffraction of partially coherent light by a circular aperture is experimentally investigated and the full-field spatial coherence function has been observed by using the proposed interferometric system. Similar to the well-known Airy disk stemming from optical diffraction, we studied the spatial coherence function near the coherence focal plan on the analogy of the Fraunhofer and Fresnel diffraction integrals. Following the conventional definitions for the optical resolutions in optical imaging system, the lateral and longitudinal resolutions for the spatial coherence imaging have been proposed.

Keywords (OCIS):

  • (030.0030) Coherence and statistical optics : Coherence and statistical optics
  • (050.1940) Diffraction and gratings : Diffraction
  • (110.0110) Imaging systems : Imaging systems
  • (350.5730) Other areas of optics : Resolution

Nonparaxial propagation of elliptical Gaussian vortex beams in uniaxial crystal orthogonal to the optical axis

  • Xun Wang, Liu Zhirong, and Daomu Zhao
  • received 06/11/2014; accepted 08/22/2014; posted 08/25/2014; Doc. ID 213751
  • [full text: PDF (5867) KB)]
  • Abstract: Analytical expressions for the three components of nonparaxial propagation of a polarized elliptical Gaussian vortex beam in uniaxial crystal orthogonal to the optical axis are derived. Intensity and phase distributions of the three components of a polarized elliptical Gaussian vortex beam propagating in a uniaxial crystal orthogonal to the optical axis are illustrated by numerical examples. Influences of the initial beam’s parameters and the parameters of the uniaxial crystal on the evolution of the beam’s intensity and phase distributions in the uniaxial crystal are examined in detail. Results show that the statistical properties of an elliptical Gaussian vortex beam nonparaxial propagating in uniaxial crystal orthogonal to the optical axis are closely determined by the initial beam’s parameters and the parameters of the crystal: the beam waist width not only affects the size of the beam profile in uniaxial crystal, but also determines the nonparaxial effect of an elliptical Gaussian vortex beam; the profile of an elliptical Gaussian vortex beam in the uniaxial crystal becomes twisted and tilted, whether the elliptical factor α is greater or smaller than unity; the beam profile is tilted to the left in positive crystal, in contrast, it is inclined to the right in negative crystal. The results indicate that uniaxial crystal provides a convenient method to modulate the intensity and phase distributions of an elliptical Gaussian vortex beam, which is beneficial to optical manipulation of microscopic particles and nonlinear optics involving in special beam profile and phase.

Keywords (OCIS):

  • (260.1180) Physical optics : Crystal optics
  • (260.1960) Physical optics : Diffraction theory
  • (350.5500) Other areas of optics : Propagation

Optical force on large sphere illuminated by Bessel beams: Comparisons between ray optics method and generalized Lorenz-Mie theory

  • Shukun Song, Neng Wang, Wanli Lu, and Zhifang Lin
  • received 05/28/2014; accepted 08/20/2014; posted 08/21/2014; Doc. ID 212995
  • [full text: PDF (2141) KB)]
  • Abstract: Optical forces are calculated for a dielectric spherical particle illuminated by a zero-order Bessel beam based on both the generalized Lorenz-Mie theory (GLMT) and ray optics method (ROM). Particles with positive and negative refractive indices are examined. The peculiar characteristics of the Bessel beam allows for the analytical expressions for the beam shape coefficients required in the GLMT as well as a decomposition of optical force into the gradient and the scattering forces irrespective of the particle size, which enable a respective comparisons for the gradient and scattering forces between the results obtained from the GLMT and the ROM. Our results demonstrate that the discrepancy between the results obtained from the GLMT and the ROM depends on the particle refractive index np, the particle size, and, also, the particle location in the beam field. As the particle size increases, the difference between the results from the GLMT and the ROM shows a general tendency of decrease, as can be expected, but the change may exhibit oscillatory rather than monotonic behavior. A phase-diagram is presented that displays the regime for particle size and refractive index where a specified accuracy can be achieved for optical force by the ROM.

Keywords (OCIS):

  • (140.7010) Lasers and laser optics : Laser trapping
  • (170.4520) Medical optics and biotechnology : Optical confinement and manipulation
  • (260.2110) Physical optics : Electromagnetic optics
  • (290.4020) Scattering : Mie theory

Comprehensively characterizing the ophthalmic freeform lenses with contour plots and astigmatic axis

  • Linling Qin, Lin Qian, and Jingchi Yu
  • received 06/10/2014; accepted 08/18/2014; posted 08/19/2014; Doc. ID 213607
  • [full text: PDF (1810) KB)]
  • Abstract: An accurate evaluating method is proposed for comprehensively characterizing the ophthalmic freeform lenses (OFLs) by computing the curvatures of the freeform surface at arbitrary direction in the transformed Cartesian coordinates based on space analytic geometry. Especially, the proposed method could give out the astigmatic axis which is an indispensable characteristics for OFLs. A designed OFL with analytical formula is characterized by our comprehensive method, not only with the power and astigmatism contour plots which are consistent with the results from the conventional method, but also with the astigmatic axis which can be analytically confirmed by combining conventional quadratic equation with directional derivatives. Benefited from the astigmatic axis, the comprehensive method could give out the combined astigmatism of both surfaces for the double OFLs, which is unavailable for the conventional method. The evaluating results of a double OFL are also presented and can be experimentally verified by fabrication and measurement. This might provide a new idea and a more comprehensive methodology of evaluating OFLs with high precision.

Keywords (OCIS):

  • (120.3620) Instrumentation, measurement, and metrology : Lens system design
  • (220.1250) Optical design and fabrication : Aspherics
  • (220.3630) Optical design and fabrication : Lenses
  • (220.4840) Optical design and fabrication : Testing
  • (230.1150) Optical devices : All-optical devices
  • (330.4460) Vision, color, and visual optics : Ophthalmic optics and devices

Crossbeam scintillations in non-Kolmogorov medium

  • Yahya Baykal
  • received 07/01/2014; accepted 08/16/2014; posted 08/18/2014; Doc. ID 214994
  • [full text: PDF (388) KB)]
  • Abstract: For the collimated and focused crossbeams, the on-axis scintillation index is evaluated when these beams propagate in weak non-Kolmogorov turbulence. In the limiting cases, our solution correctly reduces to the known Gaussian beam scintillations in Kolmogorov turbulence. For both the collimated and the focused crossbeams, large power law exponent of the non-Kolmogorov turbulence is found to result in larger scintillations. Evaluating at a fixed power law exponent, the scintillation index of the collimated (focused) crossbeam is higher (lower) than the collimated (focused) Gaussian beam scintillation index. When the asymmetry of the collimated (focused) crossbeam increases, the scintillations increase (decrease). At a given crossbeam configuration, change in the turbulence parameters varies the scintillations in the same manner for all power law exponent values.

Keywords (OCIS):

  • (010.1300) Atmospheric and oceanic optics : Atmospheric propagation
  • (010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
  • (290.5930) Scattering : Scintillation

Local transformation leading to an efficient Fourier Modal Method for perfectly conducting gratings

  • Simon Félix, Agnes Maurel, and Jean François Mercier
  • received 06/27/2014; accepted 08/13/2014; posted 08/20/2014; Doc. ID 214623
  • [full text: PDF (1765) KB)]
  • Abstract: We present an efficient Fourier modal method for the wave scattering by perfectly conducting gratings (in the two polarizations). The method uses a geometrical transformation, similar to the one used in the C-method, which transforms the grating surface into a flat surface, thus avoiding to question the Rayleigh hypothesis; also, the transformation only affects a bounded inner region which naturally matches the outer region; this allows to apply a simple criterion to select the ingoing and outgoing waves. The method is shown to satisfy the reciprocity and the energy conservation and it has an exponential rate of convergence for regular groove shapes. Besides, it is shown that the size of the inner region, where the solution is computed, can be reduced to the groove depth, that is to the minimal computation domain.

Keywords (OCIS):

  • (050.1950) Diffraction and gratings : Diffraction gratings
  • (050.2770) Diffraction and gratings : Gratings
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods

Quantitative coupled-mode model for the metal-dielectric-metal waveguide with a side-coupled cavity

  • Ying Zhong, Hongkun Zhou, and Haitao Liu
  • received 06/12/2014; accepted 08/13/2014; posted 08/14/2014; Doc. ID 213998
  • [full text: PDF (535) KB)]
  • Abstract: The Fabry-Perot model is proposed to analyze the wavelength-selective transmission behaviors of the metal-dielectric-metal waveguide with a rectangular side-coupled cavity. The guided modes propagating in the waveguide and the cavity are extracted by the aperiodic Fourier modal method. The coefficients of the model calculated by the normal-mode theory and by solving the S-matrix. The applications of such structure in the wavelength-selective filter and the refractive index sensor are also discussed. Our model is shown to be able to accurately predict the fully-vectorial data and thus can provide the reliable and quantitative analysis of this kind of devices.

Keywords (OCIS):

  • (050.2230) Diffraction and gratings : Fabry-Perot
  • (050.6624) Diffraction and gratings : Subwavelength structures
  • (230.7408) Optical devices : Wavelength filtering devices

Wave propagation analysis using the variance matrix

  • Richa Sharma, J Ivan, and C Narayanamurthy
  • received 04/18/2014; accepted 08/11/2014; posted 08/13/2014; Doc. ID 210034
  • [full text: PDF (581) KB)]
  • Abstract: The propagation of a coherent laser wave-field through a pseudo random phase plate is studied using the variance matrix estimated from the Shack Hartmann Wavefront Sensor data. The uncertainty principle is used as a tool in discriminating the data obtained from the Shack Hartmann Wavefront Sensor. Quantities of physical interest such as the twist parameter, and the symplectic eigenvalues are estimated from the wavefront sensor measurements. A distance measure between two variance matrices is introduced and used to estimate the spatial asymmetry of a wave-field in the experiment. The estimated quantities are then used to compare a distorted wave-field with its undistorted counterpart.

Keywords (OCIS):

  • (260.0260) Physical optics : Physical optics
  • (070.7345) Fourier optics and signal processing : Wave propagation

A coated sphere scattering by Geometrical Optics Approximation

  • Zhai Mengran, Lu Qieni, Zhang Hongxia, and Zhang Yinxin
  • received 05/22/2014; accepted 08/11/2014; posted 08/13/2014; Doc. ID 212216
  • [full text: PDF (737) KB)]
  • Abstract: A new geometric-optics model has been developed for the calculation of light scattering by a coated sphere, and the analytic expression for scattering is presented according to whether rays hit the core or not. The ray of various GOA terms is parameterized by the number of reflections in coating/core interface, the coating/medium interface, and the number of chords in the core, with the degeneracy path and repeated path terms considered for the rays striking the core, which simplifies the calculation. For the ray missing striking the core, the various GOA terms is dealt with by a homogeneous sphere. The incidence angle corresponding to the scattering angle is solved. The scattering intensity of coated particles are calculated and then compared with those of Debye Series and Aden-Kerker theory. The consistency of the results proves the validity of the method proposed in this paper.

Keywords (OCIS):

  • (290.5850) Scattering : Scattering, particles
  • (290.5825) Scattering : Scattering theory

Numerical ray tracing methods for eccentric radial gradient-index rod lenses

  • Shuma Horiuchi, Shuhei Yoshida, and Manabu Yamamoto
  • received 06/02/2014; accepted 08/11/2014; posted 08/13/2014; Doc. ID 213299
  • [full text: PDF (454) KB)]
  • Abstract: We propose a ray tracing method for a radial gradient-index (GRIN) rod lens with eccentric refractive index distribution. Radial GRIN rod lenses are typically treated as being rotationally symmetric around the optical axis. However, some manufacturing techniques can introduce eccentricity in the refractive index distribution, and the effect of eccentricity on the lens performance cannot be neglected in some cases. Ray tracing in an eccentric refractive index distribution is possible by extending the conventional method. This allows analysis of the imaging performance of a radial GRIN rod lenses with eccentric refractive index distribution. Since the proposed method builds on the conventional formalism for a rotationally symmetric refractive index distribution, it is simple and easy to implement.

Keywords (OCIS):

  • (080.2740) Geometric optics : Geometric optical design
  • (110.2760) Imaging systems : Gradient-index lenses
  • (080.1753) Geometric optics : Computation methods

Photon diffusion in a homogeneous medium bounded externally or internally by an infinitely long circular cylindrical applicator. VI. Time-domain Analysis

  • Daqing Piao
  • received 06/02/2014; accepted 08/10/2014; posted 08/15/2014; Doc. ID 213125
  • [full text: PDF (1739) KB)]
  • Abstract: Part VI analytically examines time-domain (TD) photon diffusion in a homogeneous medium enclosed by a “concave” circular cylindrical applicator or enclosing a “convex” circular cylindrical applicator, both geometries being infinite in the longitudinal dimension. The aim is to assess characteristics of TD photon diffusion, in response to a spatially and temporally impulsive source, versus the line-of-sight source-detector distance along the azimuthal or longitudinal direction on the concave or convex medium-applicator interface. By comparing to their counterparts evaluated along a straight line on a semi-infinite medium-applicator interface versus the same source-detector distance, the following patterns are indicated: (1) the peak photon fluence rate is always reached sooner in concave and later in convex geometry; (2) the peak photon fluence rate decreases slower along the azimuthal and faster along the longitudinal direction on the concave interface, and conversely on the convex interface; (3) the total photon fluence decreases slower along the azimuthal and faster along the longitudinal direction on the concave interface, and conversely on the convex interface; (4) the ratio between the peak photon fluence rate and the total fluence is always greater in concave geometry and smaller in convex geometry. The total fluence is equivalent to the steady-state photon fluence analyzed in Part I. The patterns of peak fluence rate, time to reaching peak fluence rate, and the ratio of these two, correspond to those of AC amplitude, phase, and modulation depth of frequency-domain results demonstrated in Part IV.

Keywords (OCIS):

  • (170.3660) Medical optics and biotechnology : Light propagation in tissues
  • (170.5280) Medical optics and biotechnology : Photon migration
  • (170.6960) Medical optics and biotechnology : Tomography

On the Intensity Distribution Function of Blazed Diffraction Gratings

  • R. Casini and P. Nelson
  • received 06/03/2014; accepted 08/07/2014; posted 08/20/2014; Doc. ID 213341
  • [full text: PDF (363) KB)]
  • Abstract: We derive from first principles the expression for the angular/wavelength distribution of the intensity diffracted by a blazed reflective grating, according to a scalar theory of diffraction. We considered the most common case of a groove profile with rectangular apex. Our derivation correctly identifies the geometric parameters of a blazed reflective grating that determine its diffraction efficiency, and fixes an incorrect but commonly adopted expression in the literature. We compare the predictions of this scalar theory with those resulting from a rigorous vector treatment of diffraction from one-dimensional blazed reflective gratings.

Keywords (OCIS):

  • (050.1950) Diffraction and gratings : Diffraction gratings
  • (070.0070) Fourier optics and signal processing : Fourier optics and signal processing

Metamaterial microwave holographic imaging system

  • John Hunt, Jonah Gollub, Tom Driscoll, Guy Lipworth, Alex Mrozack, Matt Reynolds, David Brady, and David Smith
  • received 05/07/2014; accepted 08/06/2014; posted 08/07/2014; Doc. ID 211560
  • [full text: PDF (7162) KB)]
  • Abstract: We demonstrate a microwave imaging system that combines advances in metamaterial aperture design with emerging computational imaging techniques. The flexibility inherent to guided wave, complementary metamaterials enables the design of a planar antenna that illuminates a scene with dramatically varying radiation patterns as a function of frequency. As frequency is swept over the K-band (17.5-26.5 GHz), a sequence of pseudo-random radiation patterns interrogates a scene. Measurements of the return signal versus frequency are then acquired, and the scene is reconstructed using computational imaging methods. The low-cost, frequency-diverse static aperture allows three-dimensional images to be formed without mechanical scanning or dynamic beam-forming elements. The metamaterial aperture is complementary to a variety of computational imaging schemes, and can be used in conjunction with other sensors to form a multifunctional imaging platform. We illustrate the potential of multi-sensor fusion by integrating an infrared structured-light and optical image sensor to accelerate the mm-wave scene reconstruction, and to provide a simultaneous visualization of the scene.

Keywords (OCIS):

  • (090.2910) Holography : Holography, microwave
  • (100.0100) Image processing : Image processing
  • (110.0110) Imaging systems : Imaging systems
  • (160.3918) Materials : Metamaterials
  • (070.7345) Fourier optics and signal processing : Wave propagation
  • (110.3010) Imaging systems : Image reconstruction techniques

Plane-wave Fresnel diffraction by elliptic apertures: a Fourier-based approach

  • Riccardo Borghi
  • received 05/22/2014; accepted 08/06/2014; posted 08/07/2014; Doc. ID 212568
  • [full text: PDF (1875) KB)]
  • Abstract: A simple theoretical approach to evaluate the scalar wavefield produced, within paraxial approximation, by the diffraction of a monochromatic plane wave by elliptic apertures or obstacles having arbitrary shape is presented. Two-dimensional maps of the optical intensity diffraction patterns are generated and visually compared with some experimental pictures produced in the past. An asymptotic analysis of the on-axis diffracted field is also provided and its results are compared to those obtained by the Maggi-Rubinowicz boundary wave theory.

Keywords (OCIS):

  • (000.3860) General : Mathematical methods in physics
  • (050.1960) Diffraction and gratings : Diffraction theory
  • (350.5500) Other areas of optics : Propagation

Phase control of light transmission and reflection based biexciton coherence in a defect dielectric medium

  • Seyyed Hossein Asadpour and H. Soleimani
  • received 05/28/2014; accepted 08/03/2014; posted 08/14/2014; Doc. ID 212808
  • [full text: PDF (449) KB)]
  • Abstract: Phase control of two weak probe lights transmission and reflection based biexciton coherence in a defect dielectric medium doped by four-level GaAs/AlGaAs multiple quantum wells with 15 periods of 17.5 nm GaAs wells and 15-nm Al0.3 Ga0.7As barriers is theoretically investigated. The biexciton coherence in this scheme is set up by two continuous wave control fields that couple to a resonance of biexcitons. It is shown that the transmission and reflection properties versus relative phase between applied fields can be controlled by intensity of control fields and exciton spin relaxation between exciton states. Our studies provide that many-particle interactions due to Coulomb correlations in semiconductors can be harnessed quantum coherence in an interacting many-particle system.

Keywords (OCIS):

  • (030.0030) Coherence and statistical optics : Coherence and statistical optics
  • (030.1640) Coherence and statistical optics : Coherence
  • (030.1670) Coherence and statistical optics : Coherent optical effects

Articles 1 to 20 of 26 Next Page >>





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