Výsledky vyhledávání - "Ahmed El Halawany"

Omni-resonant optical micro-cavity

Autor: Joshua Perlstein, Ahmed El Halawany, Ayman F. Abouraddy, Soroush Shabahang, Massimo L. Villinger, H. Esat Kondakci

Publikováno v: Scientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
Scientific Reports

Optical cavities are a cornerstone of photonics. They are indispensable in lasers, optical filters, optical combs and clocks, in quantum physics, and have enabled the detection of gravitational waves. Cavities transmit light only at discrete resonant

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::530796a91f70e770b03343aa3551cce2
http://link.springer.com/article/10.1038/s41598-017-10429-4

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Flexible PT-Symmetric Optical Metasurfaces

Autor: Ahmed El Halawany, Nicholas S. Nye, Mercedeh Khajavikhan, Christos Markos, D. N. Christodoulides

Publikováno v: Nye, N S, Halawany, A E, Markos, C, Khajavikhan, M & Christodoulides, D N 2020, ' Flexible PT-Symmetric Optical Metasurfaces ', Physical Review Applied, vol. 13, no. 6 . https://doi.org/10.1103/PhysRevApplied.13.064005

The synthesis of ultrathin photonic structures in order to effectively redirect and mold optical wave fronts into arbitrary shapes is of crucial importance in modern beam steering, imaging, and sensing technologies. To this end, planar subwavelength

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31c926d527184b937ac219982515db09
https://orbit.dtu.dk/en/publications/fda6bf9a-22df-4104-b234-ccf93c2aba72

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Passive PT-Symmetric Metasurfaces With Directional Field Scattering Characteristics

Autor: M. A. N. Razvi, Ahmed El Halawany, Ahmed Bakry, Ahmed Alshahrie, Demetrios N. Christodoulides, Nicholas S. Nye, Mercedeh Khajavikhan

Publikováno v: IEEE Journal of Selected Topics in Quantum Electronics. 22:107-114

We show that passive parity-time (PT) symmetric metasurfaces can be utilized to appropriately engineer the resulting far-field characteristics. Such PT-symmetric structures are capable of eliminating diffraction orders in specific directions, while m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90715dd5920000567126dc19f8aec372
https://doi.org/10.1109/jstqe.2016.2537798

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Chalcogenide fibers for improved reliability of active infrared sensing systems (Conference Presentation)

Autor: Kenneth L. Schepler, Ayman F. Abouraddy, Felix Tan, Anthony Riggins, Alex Sincore, Lawrence Shah, Martin Richardson, Justin Cook, Ahmed El Halawany

Publikováno v: Laser Technology for Defense and Security XIV.

Defense sensing systems must be both productive and robust to accomplish their mission. Active infrared sensing devices consist of many components such as the active medium, mirrors, beam-splitters, modulators, gratings, detectors, etc. Each of these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::967e18749bd9e1d245ba590ce55f64bf
https://doi.org/10.1117/12.2305229

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Mid-infrared performance of single mode chalcogenide fibers

Autor: Anthony Riggins, Kenneth L. Schepler, Lawrence Shah, Martin Richardson, Ahmed El Halawany, Justin Cook, Ayman F. Abouraddy, Felix Tan, Alex Sincore

Publikováno v: Components and Packaging for Laser Systems IV.

Due to the intrinsic absorption edge in silica near 2.4 μm, more exotic materials are required to transmit laser power in the IR such as fluoride or chalcogenide glasses (ChGs). In particular, ChG fibers offer broad IR transmission with low losses 1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b45854c7d2bb4e36a0494e5883e1d9bc
https://doi.org/10.1117/12.2290127

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Broadband coherent perfect absorption in graphene via an omniresonant optical microcavity

Autor: Ahmed El Halawany, Soroush Shabahang, Ayman F. Abouraddy, H. Esat Kondakci, Massimo L. Villinger, Ali K. Jahromi

Publikováno v: 2017 IEEE Photonics Conference (IPC).

Coherent perfect absorption refers to total light absorption through interferometric effects, which only occurs at resonance wavelengths. Here we show a perfect absorption continuously across a broad bandwidth through an ‘omniresonant cavity’: a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82f6218b0b02dc00f47a5e7d54fb9cdd
https://doi.org/10.1109/ipcon.2017.8116183

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Scene reconstruction via coherency imaging

Autor: Andre Beckus, Ahmed El-Halawany, Ayman F. Abouraddy, Nafiseh Mohammadian, H. Esat Kondakci, George K. Atia, Morgan Monroe

Publikováno v: 2017 IEEE Photonics Conference (IPC).

We implement numerical back-propagation of the experimentally obtained spatial complex coherence function to estimate both the axial and transverse positions of 1D objects. The measurement of the coherence function of partially coherent light is perf

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::04ba7da72b24a3b0ff6ac7ba69a2b63e
https://doi.org/10.1109/ipcon.2017.8116243

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Decoherence and quantum interference assisted electron trapping in a quantum dot

Autor: Michael N. Leuenberger, Ahmed El Halawany

Publikováno v: physica status solidi (b). 251:1498-1509

We present a theoretical model for the dynamics of an electron that gets trapped by means of decoherence and quantum interference in the central quantum dot (QD) of a semiconductor nanoring (NR) made of five QDs, between 100 and 300 K. The electron's

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::18a31749ddff9a6b5fc366615f4b64b3
https://doi.org/10.1002/pssb.201350266

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