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Khaled Kirah  - - - 
Top co-authors
Tarik Bourouina

14 shared publications

Université Paris-Est, ESIEE Paris, ESYCOM EA 2552, 93162 Noisy-le-Grand, France

Yasser M. Sabry

11 shared publications

Faculty of Engineering, Ain-Shams University, Cairo 11566, Egypt

Frédéric Marty

7 shared publications

Université Paris-Est, ESIEE Paris, ESYCOM EA 2552, 93162 Noisy-le-Grand, France

Diaa Khalil

5 shared publications

Faculty of Engineering, Ain Shams University, 1 Elsarayat St., Cairo, Egypt

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Publication Record
Distribution of Articles published per year 
(2012 - 2018)
Total number of journals
published in
 
9
 
Publications See all
Article 0 Reads 0 Citations In-plane coupled Fabry–Perot micro-cavities based on Si-air Bragg mirrors: a theoretical and practical study Mohamed N. Ali, Yasser M. Sabry, Frédéric Marty, Tarik Bouro... Published: 15 June 2018
Applied Optics, doi: 10.1364/ao.57.005112
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Numerical investigation of whispering gallery modes in dielectric nanospheres for photovoltaic applications Sameh Abdellatif, Khaled. Kirah, Rami Ghannam, Ahmed S. G. K... Published: 01 March 2018
2018 35th National Radio Science Conference (NRSC), doi: 10.1109/nrsc.2018.8354352
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Optical investigation of porous TiO2 in mesostructured solar cells Sabine Josten, Sameh Osama Ezzat Abdellatif, Parvin Sharifi,... Published: 23 February 2018
Physics and Simulation of Optoelectronic Devices XXVI, doi: 10.1117/12.2288376
DOI See at publisher website
PROCEEDINGS-ARTICLE 1 Read 0 Citations Comprehensive study of various light trapping techniques used for sandwiched thin film solar cell structures Khaled A. Kirah, S. Abdellatif, R. Ghannam, A. S. G. Khalil,... Published: 16 February 2018
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII, doi: 10.1117/12.2291613
DOI See at publisher website
PROCEEDINGS-ARTICLE 9 Reads 0 Citations Coupled-Cavity Optofluidic Fabry-Perot Resonators for Enhanced Volume Refractometry Mohamed Nabil Ali, Yasser M. Sabry, Fredric Marty, Tarik Bou... Published: 21 July 2017
Proceedings of The 7th International Multidisciplinary Conference on Optofluidics 2017, doi: 10.3390/optofluidics2017-04155
DOI See at publisher website ABS Show/hide abstract
This paper reports the design, fabrication and preliminary characterization of optofluidic Fabry-Perot micro coupled cavities enabling on-chip refractometry with large dynamic range. Large dynamic range refractometry is needed in several applications such as in portable food analyzers, where the quality of fruits and beverages are classified based on their Brix number, which indicates the sugar content. The Brix numbers is obtained from the refractive index using standard conversion tables [1-2], where the refractive index varies from 1.333 (0 oB) to 1.49 (80 oB). The conventional design of integrated refractometer is based on Fabry-Perot cavity, in which the wavelength of longitudinal modes shifts with the change in the refractive index of the filling medium [3-4]. Their dynamic range is usually in the order of 10-3, limited by the free spectral range (FSR) of the micro cavity. Therefore, the food analyzers are usually based on volume optics components and the change of the refraction angle with the change in the refractive index that allows for the large dynamic range of sensing. In this work, we report a novel design based on cascading two coupled Fabry-Perot micro cavities allowing for orders of magnitude increase in the FSR besides the decrease in the linewidth which enhances the resolution as well. Fig. 1 shows the schematic diagram of the new design and the idea of operation. The lengths of the two cavities are slightly different and adjusted such that some modes are suppressed after each allowed mode. The use of Si/Air layers to form the Bragg mirror with thickness of 3.8/3.6 mm allowed us to achieve designs with mode separation of 40 nm around a wavelength of 1550 nm. Fig. 2 shows a SEM photo of part of the fabricated structures. The fabrication was done using standard MEMS technology in which DRIE process is used to make a 150 mm deep etching in Si to form the Bragg mirrors, fiber grooves, and the microfluidic channels and ports. Test structures in the form of single cavities and mirrors were also fabricated on the same chip. Fig. 3 shows the measured transmittance of one of the fabricated coupled-cavities together with the measured transmittance of the single cavity corresponding to one of them. The single cavity has a length of 128 mm and the coupled-cavities have lengths L1 = 160 mm and L2 = 128 mm as referred to Fig. 1. The mirrors are composed of two Si layers in both cases. We can see the increase in the FSR achieved in the coupled cavity which is about 3 times as the single cavity and also the reduction in the line-width by less than half. In fact the technology tolerance, especially the over-etching, had a great effect on the fabricated structures. The fabricated mirrors had a wider bandwidth than expected and we could obtain a much larger FSR in the coupled-cavity. In some designs we obtained only one peak in the whole measured band of 140 nm.
Article 0 Reads 0 Citations Modelling Various Solar Cells Materials Using Lorentzian-Drude Coefficients Sameh Osama Abdellatif, Khaled Kirah, Rami Ghannam, Ahmed Kh... Published: 30 December 2016
International Journal of Recent Contributions from Engineering, Science & IT (iJES), doi: 10.3991/ijes.v4i4.6566
DOI See at publisher website
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