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ABSTRACT: The dyadic Green's function (DGF) is applied to examine the effect of focal shift in a spherical microlens with the variation of the numerical aperture for a given Fresnel number when a monochromatic plane wave with x linear polarization is incident on the microlens. By comparing the results based on the method for the vector Kirchhoff diffraction theory [J. Opt. Soc. Am. A22, 68-76 (2005)], the effect of the spherical aberration on focal shift in a microlens is evaluated, and the influences of NA as well as the spherical aberration on the transverse electric energy density distribution in the focal plane are also investigated. In contrast with other vector formulations of imaging theory, which mainly focus on the focal shift in an aplanatic system, the DGF method is more practical and effective to locate the principal maximum energy density along the normal axis and to study transverse electric energy density distribution, because the actual shape of a microlens and the effects of aberrations are considered.
Applied Optics 02/2009; 48(2):321-7. · 1.41 Impact Factor
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ABSTRACT: In terms of the electromagnetic theory described in Part I of our current investigations [J. Opt. Soc. Am. A24, 1776 (2007)], the numerical method for and results of numerical computations corresponding to the electromagnetic theory of a waveguide multilayered optical memory are presented. Here the characteristics of the cross talk and the modulation contrast, the power of readout signals, the variation of the power of the readout signals with the scanning position along the track, and the distribution of the light intensity at the detector are investigated in detail. Results show that the polarization of the reading light, the feature sizes of bits, and the distances between the two adjacent tracks and the two adjacent bits on the same track have significant effects on the distribution of the light intensity at the detector, the power of the readout signals, the cross talk, and the modulation contrast. In addition, the optimal polarization of the reading light is also suggested.
Journal of the Optical Society of America A 08/2008; 25(7):1799-809. · 1.56 Impact Factor
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ABSTRACT: In terms of the electromagnetic theories described in Part I of our current investigations [J. Opt. Soc. Am. A24, 1776 (2007)] and in [Opt. Express 16, 2797 (2008)], the characteristics of the cross talk and the modulation contrast and the variation of the power of the readout signals with the scanning position along the track are investigated in detail by computer simulations for a conventional multilayered optical memory (CMOM), where the two cases, i.e., the storage medium being homogenous and planar stratified homogenous, are considered. Results show that the feature sizes of bits, the distances between the two adjacent tracks, and the thickness of layers have significant effects on the cross talk and the modulation contrast. The polarization of the reading light also has significant effects on the cross talk, whereas it has only slight effects on the modulation contrast. Moreover, for a CMOM, the optimal polarization of the reading light is suggested.
Journal of the Optical Society of America A 08/2008; 25(7):1810-9. · 1.56 Impact Factor
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ABSTRACT: A full and rigorous vector diffraction model for a multilayered optical disc is described where three vector diffraction processes, namely the focus of the reading light, the interaction with bits and the detection part, are all considered. Moreover, the reflected electric fields resulting from the infinite number of bounces at the multilayered optical disc are also involved. As an example, the detected power is calculated when the reading spot is scanned over the disc under the case of the circularly polarized illumination.
Optics Express 03/2008; 16(4):2797-803. · 3.59 Impact Factor
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ABSTRACT: An analysis procedure for evaluating the refractive index and the thickness of 5-10-µm-thick transparent films has been developed based on variable-angle spectroscopic ellipsometry. As an example of application, results from an analysis of benzocyclobutene films are presented. The sensitivities in ψ and Δ with respect to the refractive index and the thickness of the films are also discussed.
Applied Optics 04/1996; 35(10):1693-9. · 1.41 Impact Factor
