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Saturable absorber nanolithography by vectorial nonparaxial gaussian beam
, Article 3rd Mediterranean Photonics Conference, MePhoCo ; 7 - 9 May , 2014 , pp. 1 - 3 ; ISBN: 9781479948185 ; Afsary, M ; Bahrampour, A. R ; Sharif University of Technology
Abstract
The non-paraxial and vectorial effects have an important role in the dynamics of highly confined beam in nonlinear medium. In this paper, we study the vectorial non-paraxial propagation of Gaussian field in the saturable absorber media numerically with the aim of nano-lithography. It is shown that in the optimal regimes for nanolithography, the mutual coupling between components of optical field and mode coupling between different orders of Hermite-Gaussian mode lead to generation of various patterns upon propagation through saturable absorber media. The vectorial effect is responsible for the symmetry breaking. For converging input beam, while the intense part of the beam goes toward the...
Quantum imaging as an ancilla-assisted process tomography
, Article Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 94, Issue 4 , 2016 ; 10502947 (ISSN) ; Afsary, M ; Alipour, S ; Rezakhani, A. T ; Sharif University of Technology
American Physical Society
2016
Abstract
We show how a recent experiment of quantum imaging with undetected photons can basically be described as an (a partial) ancilla-assisted process tomography in which the object is described by an amplitude-damping quantum channel. We propose a simplified quantum circuit version of this scenario, which also enables one to recast quantum imaging in quantum computation language. Our analogy and analysis may help us to better understand the role of classical and/or quantum correlations in imaging experiments. © 2016 American Physical Society