Výsledky vyhledávání - "Hashemi, Mahdieh"

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Plano-concave microlenses with epsilon-near-zero surface-relief coatings for efficient shaping of nonparaxial optical beams

Autor: Naserpour, Mahin, Zapata-Rodriguez, Carlos J., Hashemi, Mahdieh

Epsilon-near-zero (ENZ) materials, including artificial metamaterials, have been advanced to mold laser beams and antenna-mediated radiated waves. Here we propose an efficient method to control Ohmic losses inherent to natural ENZ materials by the as

Externí odkaz: http://arxiv.org/abs/1701.02850

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Metacoatings for wavelength scale, high NA plano-concave focusing lenses

Autor: Naserpour, Mahin, Zapata-Rodríguez, Carlos J., Díaz-Aviñó, Carlos, Hashemi, Mahdieh

Publikováno v: J. Opt. Soc. Am. B 33, 2120-2128 (2016)

We design plano-concave silicon lenses with coupled gradient-index plasmonic metacoatings for ultrawide apertured focusing utilizing a reduced region of $\sim 20 \lambda^2$. The anomalous refraction induced in the planar input side of the lens and in

Externí odkaz: http://arxiv.org/abs/1606.01499

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A high-performance TE modulator/TM-pass polarizer using selective mode shaping in a VO2-based side-polished fiber

Autor: Heidari Mohsen, Faramarzi Vahid, Sharifi Zohreh, Hashemi Mahdieh, Bahadori-Haghighi Shahram, Janjan Babak, Abbott Derek

Publikováno v: Nanophotonics, Vol 10, Iss 13, Pp 3451-3463 (2021)

The reversible insulating-to-conducting phase transition (ICPT) of vanadium dioxide (VO2) makes it a versatile candidate for the implementation of integrated optical devices. In this paper, a bi-functional in-line optical device based on a four-layer

Externí odkaz: https://doaj.org/article/f8653597f15d49ceafdd84ff1897c857

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