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The manufacturing process of flexible substrates develops the residual stress which leads to the birefringence. This birefringence can affect the polarization of the light passing through substrate along with the spectral changes in LCDs. We report that the effect of the birefringence of flexible substrate on the polarization state of the light passing through it. We observed that by aligning the...
Superposition of two optical vortex beams form composite vortex beam and the characteristics of the resultant depend on the separation and the relative phases of the interfering vortex beams. We analyze these composite vortex filters.
An ultra-stable high performance SPR sensor based on graphene on Ag configuration is proposed. The proposed sensor shows enhanced performance as compared to widely reported Au on Ag configuration.
We propose an image encryption scheme based on the double phase encoding in fractional Fourier transform domain for securing two gray-scale images. For encryption, an image to be encrypted is converted into a phase-only image using modified Gerchberg-Saxton algorithm, which serves as a fractional Fourier domain key for encrypting another image employing double random phase encoding framework. For...
In this paper, we claim that asymmetric cryptosystem using spherical wave illumination is vulnerable against specific attack. The combination of spherical wave parameters can easily be obtained in order to decrypt the image through specific attack. We also suggested an improvement so that asymmetric cryptosystem based on spherical wave illumination resists such attacks.
We present bright and dark solitons induced by the non-Kerr terms in generalized nonlinear Schrödinger equation. The reported solutions consist the Lorentzian-type algebraic solitons. These solitons are of sub 10 femtosecond width and are helpful to increase the information carrying capacity in order to make ultrafast communication, which is useful for transcontinental and trans-oceanic data transfer.
Estimation of the blood oxygen saturation in human retina has been done by using FDOCT data. This was achieved by using 1060 nm as central wavelength, 120 nm as bandwidth, which is optimized wavelength for imaging biological samples. Least squares method was implemented for data analysis. The estimated results of blood oxygen saturation levels in an artery and the veins are well comparable with existing...
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