Accepted papers to appear in an upcoming issue
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Correlation of Intensity Fluctuations in Beams Generated by Quasi-homogeneous Sources
- received 06/26/2014; accepted 07/27/2014; posted 08/13/2014; Doc. ID 214806
- [full text: PDF (1124) KB)]
- Abstract: We derive expressions for the correlation of intensity uctuations (the Hanbury Brown-Twiss eect) that occurs in electromagnetic beams that are generated by quasi-homogeneous sources. Such sources often have a radiant intensity pattern that is rotationally symmetric, irrespective of the source shape. We demonstrate how from the far-zone correlation of intensity uctuations the spectral density distribution across the source plane may be reconstructed.
- (030.0030) Coherence and statistical optics : Coherence and statistical optics
- (050.1960) Diffraction and gratings : Diffraction theory
- (260.2110) Physical optics : Electromagnetic optics
Non-ideal ultrathin mantle cloak for electrically large conducting cylinders
- received 05/30/2014; accepted 07/25/2014; posted 08/08/2014; Doc. ID 212760
- [full text: PDF (1039) KB)]
- Abstract: Based on the concept of scattering cancellation technique, we propose a non-ideal ultrathin mantle cloak that can efficiently suppress the total scattering cross sections of an electrically large conducting cylinder (over one free space wavelength). The cloaking mechanism is investigated in depth based on the Mie scattering theory and is simultaneously interpreted from the perspective of far-field bistatic scattering and near-field distributions. We remark that, unlike the perfect transformation optics (TO) based cloak, this non-ideal cloaking technique is mainly designed to minimize simultaneously several scattering multipoles of a relatively large geometry around considerably broad bandwidth. Numerical simulations and experimental results show that the anti-scattering ability of the metasurface gives rise to excellent total scattering reduction of the electrically large cylinder and remarkable electric-field restoration around the cloak. The outstanding cloaking performance together with the good features of ultra-low profile, flexibility and easy fabrication predict promising applications in the microwave frequencies.
- (260.2110) Physical optics : Electromagnetic optics
- (160.3918) Materials : Metamaterials
- (230.3205) Optical devices : Invisibility cloaks
(30th Anniversary) Partially coherent beam propagation in atmospheric turbulence
- received 07/16/2014; accepted 07/18/2014; posted 08/05/2014; Doc. ID 217030
- [full text: PDF (351) KB)]
- Abstract: Partially coherent beams hold much promise in free-space optical communications for their resistance to the deleterious effects of atmospheric turbulence. We describe the basic theoretical and computational tools used to investigate these effects, and review the research to date.
- (030.1640) Coherence and statistical optics : Coherence
- (030.7060) Coherence and statistical optics : Turbulence
- (060.2605) Fiber optics and optical communications : Free-space optical communication
Boundary Integral Spectral Element Method Analyses of Extreme Ultraviolet Multilayer Defects
- received 07/01/2014; accepted 07/02/2014; posted 08/07/2014; Doc. ID 215095
- [full text: PDF (744) KB)]
- Abstract: Extreme ultraviolet (EUV) lithography is an emerging technology for high density semiconductor patterning. The multilayer distortion caused by the mask defects is regarded as one of the critical challenges of EUV lithography. To simulate the influence of the defected nano-scale structures with high accuracy and efficiency, we have developed a boundary integral spectral element method (BI-SEM) that combines the SEM with a set of surface integral equations. The SEM is used to solve the interior computational domain, while the open boundaries are truncated by the surface integral equations. Both 2-dimensional and 3-dimensional EUV cases are simulated. Through comparing the performance of this method with the conventional finite element method, it is shown that the proposed BI-SEM can greatly decrease both the memory cost and computation time. For typical 2-D problems, we show that the BI-SEM is 11 and 1.25 times more efficient than the finite element method (FEM) in terms of memory and CPU time, respectively, while for 3-D problems, these factors are over 14 and 2, respectively, for smaller problems; realistic 3-D problems that cannot be solved by the conventional FEM can be accurately simulated by the BI-SEM.
- (000.4430) General : Numerical approximation and analysis
- (260.7200) Physical optics : Ultraviolet, extreme
- (110.4235) Imaging systems : Nanolithography
(CV) Independence and interaction of luminance and chromatic contributions to spatial hyperacuity performance
- received 09/30/2013; accepted 02/02/2014; posted 02/03/2014; Doc. ID 198653
- [full text: PDF (1336) KB)]
- Abstract: Here we test interactions of luminance and chromatic input to spatial hyperacuity mechanisms. First, we tested alignment with matching or mismatching (contrast polarity or modality) grating pairs that were adjusted to detection threshold. Thresholds with mismatched pairs were significantly elevated. Second, we determined alignment acuity as a function of luminance or chromatic contrast alone or in the presence of contrast pedestals. For in-phase pedestal conditions, performance followed the envelope of the more sensitive mechanism. However, polarity reversals revealed an asymmetric effect for luminance and chromatic conditions. This suggests that luminance can overrule chromatic mechanisms in hyperacuity; we interpret these findings in the context of spatial mechanisms.
- (330.1720) Vision, color, and visual optics : Color vision
- (330.5510) Vision, color, and visual optics : Psychophysics
- (330.6100) Vision, color, and visual optics : Spatial discrimination