Topic
Physical optics
About: Physical optics is a research topic. Over the lifetime, 5342 publications have been published within this topic receiving 101388 citations. The topic is also known as: wave optics.
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14 Dec 2012
TL;DR: In this paper, Lakshminarayanan and S.Rodriguez proposed the Decomposition Method to Solve Differential Equations (DME) for optical applications.
Abstract: Special Problems in Ray Optics Orbital Angular Momentum: A Ray Optical Interpretation, M. Padgett Wigner Distributions Moments for Beam Characterization, T. Alieva, A. Camara, and M.J. Bastiaans Dynamic Programming Applications in Optics, M.L. Calvo, J. Perez-Rios, and V. Lakshminarayanan Mathematical Formalism in Wave Optics Basis Expansions for Monochromatic Field Propagation in Free Space, M.A. Alonso and N.J. Moore Solutions of Paraxial Equations and Families of Gaussian Beams, E. Abramochkin, T. Alieva, and J.A. Rodrigo The Decomposition Method to Solve Differential Equations: Optical Applications, V. Lakshminarayanan and S. Nandy Plasmonics An Introduction to Mathematics of Transformational Plasmonics, M. Kadic, S. Guenneau, and S. Enoch Plasmonics: Computational Approach, M. Sukharev Applications of Group Theory in Optics Lorentz Group in Ray and Polarization Optics, S. Baskal and Y.S. Kim Paraxial Wave Equation: Lie Algebra-Based Approach, A. Torre Dihedral Polynomials, M. Viana Lie Algebra and Liouville Space Methods in Quantum Optics, M. Ban Quantum Optics Methods From Classical to Quantum Light and Vice Versa: Quantum Phase-Space Methods, A. Luis Coherence Functions in Classical and Quantum Optics, I. Ashraf Zahid and V. Lakshmianrayanan Quantum Memory Channels in Quantum Optics, T. Rybar, M. Zyman, and V. Buzek Computational Optics/Image Processing An Introduction to Super-Resolution Imaging, J.D. Simpkins and R.L. Stevenson The Differential Structure of Images, B.M. ter Haar Romeny Index
23 citations
TL;DR: Reconstructed images of continuous and discrete conducting objects and a B-52 model aircraft measured in the frequency range 7.5-12.5 GHz are shown in good agreement with the scattering object geometries, demonstrating the effectiveness of the developed four-port microwave imaging system.
Abstract: In this paper, an effective usage of a vector network analyzer (VNA) for microwave imaging of conducting objects is presented. In the measurement arrangement, a novel four-port transmission test set is developed to combine with a laboratory VNA as a four-port transmission VNA. It is shown to effectively acquire four sets of the frequency-swept object scattered field in a multistatic arrangement for each object rotation angle. The image reconstruction formulations of this arrangement are derived under physical optics approximation. The measurement system, calibration method, and experimental results are presented. Reconstructed images of continuous and discrete conducting objects and a B-52 model aircraft measured in the frequency range 7.5-12.5 GHz are shown in good agreement with the scattering object geometries. These measured results demonstrate the effectiveness of the developed four-port microwave imaging system.
23 citations
TL;DR: In this paper, the power response of a Doppler reflectometer is investigated by means of the physical optics model, a simple model which considers basic scattering processes at the reflection layer.
Abstract: The power response of a Doppler reflectometer is investigated by means of the physical optics model, a simple model which considers basic scattering processes at the reflection layer. Apart from linear and saturated scattering regimes, non-linear regimes with an enhanced backscattered power are found. The different regimes are characterized and understood based on analytical calculations. The power response is also studied with 2D full wave simulations, where the enhanced backscattered power regimes are also found in qualitative agreement with the physical optics results. The ordinary and extraordinary mode are compared for the same angle of incidence, concluding that ordinary mode is better suited for Doppler reflectometry turbulence level measurements due to the linearity of its response. The scattering efficiency is studied and a first approximation to describe it is proposed. At the end, the application of the physical optics results to experimental data analysis is discussed, in particular a formula to assess the linearity of Doppler reflectometry measurements is provided.
22 citations
20 Oct 2004
TL;DR: In this paper, the authors compared predictions of scintillation for ground-to-space collimated Gaussian beams generated from a numerical wave optics simulation with the results from the Rytov perturbation approach and concluded that the analytic theory is incomplete, leading to the output of incorrect predictions for the second moment of irradiance.
Abstract: Predictions of scintillation for ground to space collimated Gaussian beams generated from a numerical wave optics simulation are compared with recent weak scintillation theory developed from the Rytov perturbation approach (L.C. Andrews, R.L. Phillips, P.T. Yu, Ap Opt 34 , p 7742-7751, 1995; J.D. Shelton, JOSA A 12 , p 2172-2181, 1995). Significant discrepancies are revealed for intermediate-sized beams, defined as beams whose initial diameters place the near ground turbulence in the transmitter near field and the remote space target in the transmitter far field. By adding wander tracking to the wave optics simulation, and by developing a separate analytic model of the beam wander scintillation mechanism, we show that the scintillation for intermediate-sized beams is dominated by turbulence-induced beam wander at the target, and that the results from the wave optics simulation are accurate. We conclude that the analytic theory’s treatment of beam wander is incomplete, leading to the output of incorrect predictions for the second moment of irradiance. The error is most severe at the target point on the transmitter’s optical axis.
22 citations
TL;DR: A procedure for accurate solution of scattering problems involving geometries with sharp edges by using physical optics-based characteristic basis functions, which themselves do not possess edge singularities, is presented in this communication.
Abstract: A procedure for accurate solution of scattering problems involving geometries with sharp edges by using physical optics-based characteristic basis functions, which themselves do not possess edge singularities, is presented in this communication. Our strategy is to employ special types of blocks that contain the free edges of the object, within which we can accurately represent the behaviors of the currents with rapidly varying amplitudes, still by using physical optics (PO)-types functions for the initial bases. The set of geometrical blocks which are associated solely with the edges extend along each edge, but have a relatively small width. The final number of characteristic basis functions using this approach is only slightly greater than that needed in the conventional characteristic basis function method (CBFM), which does not utilize the edge-block strategy. However, the accuracy in the final results is notably improved in some cases.
22 citations