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Yasser Sabry   Dr.  University Lecturer 
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Yasser Sabry published an article in February 2019.
Top co-authors See all
Tarik Bourouina

14 shared publications

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

Khaled Kirah

10 shared publications

Engineering Physics Department, Faculty of Engineering, Ain Shams University, Abbasiya, Cairo, Egypt

Martine Capochichi-Gnambodoe

8 shared publications

Université Paris-Est, UPEM, ESYCOM EA 2552, 5 Boulevard Descartes, 77420 Champs sur Marne, France

Frédéric Marty

7 shared publications

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

Yamina Ghozlane Habba

6 shared publications

Université Paris-Est, UPEM, ESYCOM EA 2552, 5 Boulevard Descartes, 77420 Champs sur Marne, France

11
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12
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Publication Record
Distribution of Articles published per year 
(2015 - 2019)
Total number of journals
published in
 
6
 
Publications See all
Article 0 Reads 0 Citations On-Channel Integrated Optofluidic Pressure Sensor with Optically Boosted Sensitivity Noha Gaber, Ahmad Altayyeb, Sherif A. Soliman, Yasser M. Sab... Published: 23 February 2019
Sensors, doi: 10.3390/s19040944
DOI See at publisher website ABS Show/hide abstract
A novel optofluidic sensor that measures the local pressure of the fluid inside a microfluidic channel is presented. It can be integrated directly on-channel and requires no additional layers in fabrication. The detection can be accomplished at a single wavelength; and thereby, only a single laser diode and a single photodetector are required. This renders the sensor to be compact, cheap and easy to fabricate. Basically, the sensor consisted of a Fabry–Pérot microresonator enclosing the fluidic channel. A novel structure of the Fabry–Pérot was employed to achieve high-quality factor, that was essential to facilitate the single wavelength detection. The enhanced performance was attributed to the curved mirrors and cylindrical lenses used to avoid light diffraction loss. The presented sensor was fabricated and tested with deionized water liquid and shown to exhibit a sensitivity up to 12.46 dBm/bar, and a detection limit of 8.2 mbar. Numerical simulations are also presented to evaluate the mechanical–fluidic performance of the device.
Article 0 Reads 0 Citations Modal analysis of TE and TM excitations in a metallic slotted micromirror Muhammad A. Othman, Yasser M. Sabry, Ahmed M. Othman, Ismail... Published: 08 February 2019
Journal of the Optical Society of America B, doi: 10.1364/josab.36.000610
DOI See at publisher website
Article 0 Reads 0 Citations Incoherent Gain-Assisted Ring Enhanced Gas Absorption Spectroscopy Mahmoud A. Selim, George A. Adib, Yasser M. Sabry, Diaa Khal... Published: 01 February 2019
IEEE Journal of Quantum Electronics, doi: 10.1109/jqe.2018.2890214
DOI See at publisher website
Article 0 Reads 1 Citation High-Q Fabry–Pérot Micro-Cavities for High-Sensitivity Volume Refractometry Noha Gaber, Yasser M. Sabry, Mazen Erfan, Frederic Marty, Ta... Published: 31 January 2018
Micromachines, doi: 10.3390/mi9020054
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
This work reports a novel structure for a Fabry–Pérot micro cavity that combines the highest reported quality factor for an on-chip Fabry–Pérot resonator that exceeds 9800, and a very high sensitivity for an on-chip volume refractometer based on a Fabry–Pérot cavity that is about 1000 nm/refractive index unit (RIU). The structure consists of two cylindrical Bragg micromirrors that achieve confinement of the Gaussian beam in the plan parallel to the chip substrate, while for the perpendicular plan, external fiber rod lenses (FRLs) are placed in the optical path of the input and the output of the cavity. This novel structure overcomes number of the drawbacks presented in previous designs. The analyte is passed between the mirrors, enabling its detection from the resonance peak wavelengths of the transmission spectra. Mixtures of ethanol and deionized (DI)-water with different ratios are used as analytes with different refractive indices to exploit the device as a micro-opto-fluidic refractometer. The design criteria are detailed and the modeling is based on Gaussian-optics equations, which depicts a scenario closer to reality than the usually used ray-optics modeling.
CONFERENCE-ARTICLE 9 Reads 0 Citations <strong>Coupled-Cavity Optofluidic Fabry-Perot Resonators for Enhanced Volume Refractometry</strong> Mohamed Ali, Yasser M. Sabry, Fredric Marty, Tarik Bourouina... Published: 21 July 2017
Proceedings of The 7th International Multidisciplinary Conference on Optofluidics 2017, doi: 10.3390/optofluidics2017-04155
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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.

CONFERENCE-ARTICLE 9 Reads 0 Citations <strong>NOVEL DESIGN OF FABRY&ndash;P&Eacute;ROT CAVITIES ACHIEVING SUPERIOR SENSITIVITY FOR VOLUME REFRACTOMETRY OF HOM... Noha Gaber, Yasser M. Sabry, Mazen Erfan, Frédéric Marty, Ta... Published: 21 July 2017
Proceedings of The 7th International Multidisciplinary Conference on Optofluidics 2017, doi: 10.3390/optofluidics2017-04188
DOI See at publisher website ABS Show/hide abstract

This paper reports a new design of optofluidic Fabry–Pérot (FP) micro cavity that combines the highest reported quality factor for an on-chip FP resonator that exceeds 3600, and the highest reported sensitivity for an on-chip volume refractometer based on a FP cavity that is about 1000 nm/RIU.

For using the optical resonator as a refractometer, it is convenient to have sharp and highly selective resonance peaks for accurate measurements; thereby the quality factor (Q) of the resonator is preferred to be high. The highest reported Q factor reported by other groups is only 400 [1]. This limitation comes from using straight mirror for the FP, which causes high diffraction loss due to beam expansion after few round trips. Our group has previously reported a cavity employing curved mirrors and a micro-tube in-between holding the analyte [2]. The curvature of the mirrors and the micro-tube achieved better light confinement and hence high Q factors up to 2,800. On the other hand, the sensitivity was only 428 nm/RIU since the analyte doesn’t fill the entire cavity. The highest reported sensitivity by literature was 907 nm/RIU in case of the analyte occupying the whole cavity [1].

In this work, a novel structure for FP micro-cavity is reported, achieving both high Q factor resonator and high sensitivity refractometer. The proposed structure is schematically depicted in Fig. 1. It employs cylindrical Bragg mirrors forming the FP cavity to confine light in the in-plane direction, while an external cylindrical lens - implemented by a fiber rod lens (FRL) - is used to confine light in the out-of-plane direction before it enters the FP cavity and after it exits to be efficiently collected by the collecting fiber. The cavities are fabricated from silicon by Deep Reactive Ion Etching (DRIE) process, and then capped by a PDMS cover. The FRLs are placed later after micro fabrication. A photo of the chip combining several cavities with different lengths is shown in Fig. 2. The analyte is passed between the mirrors enabling its detection from the shift of resonance peaks of the transmission spectra. The spectra are obtained by recording the output from an optical detector while varying the input light wavelength from a tunable laser in the near infrared band. The spectrum of a cavity of 318 µm physical length filled with DI-water is presented in Fig. 3 showing the narrow line widths of the resonance peaks. The peak has a linewidth of 0.44 nm, which provides a Q factor of 3649.

Mixtures of ethanol and DI-water with different ratios are used as analytes with different refractive indices to exploit the device as a micro-opto-fluidic refractometer, which are plotted in Fig. 4. The sensitivity is obtained from the slope of the linear plot in Fig. 5 of the resonance wavelength shift versus the difference in refractive index between the analytes and the DI-water, which is taken as a reference. The cavity used has a physical length of 256 µm and the obtained sensitivity is 1000 nm/RIU.

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