Mahmoud Hamdy Elshorbagy

Dr. Mahmoud Hamdy Elshorbagy

Post doc. Researcher at Complutense University of Madrid
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Academic Career Length

14Years (2013-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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2 November 2017 in Photonics Research
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
ACAlexander Cuadrado Conde
Alexander Cuadrado Conde
Javier AldaJavier Alda
Javier Alda
A metallic nanostructured array that scatters radiation toward a thin metallic layer generates surface plasmon resonances for normally incident light. The location of the minimum of the spectral reflectivity serves to detect changes in the index of refraction of the medium under analysis. The normal incidence operation eases its integration with optical fibers. The geometry of the arrangement and the material selection are changed to optimize some performance parameters as sensitivity, figure of merit, field enhancement, and spectral width. This optimization takes into account the feasibility of the fabrication. The evaluated results of sensitivity (1020 nm/RIU) and figure of merit (614 RIU−1) are competitive with those previously reported.
27 March 2019 in Journal of Lightwave Technology
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
ACAlexander Cuadrado Conde
Alexander Cuadrado Conde
GGGabriel Gonzalez
Gabriel Gonzalez
FGFrancisco Gonzalez
Francisco Gonzalez
Javier AldaJavier Alda
Javier Alda
In this paper, we present a plasmonic refractometric sensor that works under normal incidence; allowing its integration on a fiber tip. The sensor's material and geometry exploit the large scattering cross-section given by high-contrast of the index of refraction subwavelength dielectric gratings. Our design generates a hybrid plasmonic-Fano resonance due to the interference between the surface plasmon resonance and the grating response. We optimize the sensor with a merit function that combines the quality parameter of the resonance and the field enhancement at the interaction volume where the plasmon propagates. Our device shows a high sensitivity (1000 nm/RIU) and a high Figure of Merit (775 RIU $^{-1}$ ). Degradation in performance is negligible through a wide dynamic range up to 0.7 RIU. These quantitative parameters overperform compared to similar plasmonic sensors.
1 May 2017 in Optics Communications
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
KAKamal Abdel-Hady
Kamal Abdel-Hady
HKHala Kamal
Hala Kamal
JAJavier Alda
Javier Alda
1 January 2017 in Optik
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
RRREHAB RAMADAN
REHAB RAMADAN
KAK. Abdelhady
K. Abdelhady
1 May 2020 in Solar Energy
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
ELEduardo López-Fraguas
Eduardo López-Fraguas
JSJosé Manuel Sánchez-Pena
José Manuel Sánchez-Pena
BGBraulio García-Cámara
Braulio García-Cámara
RVRicardo Vergaz
Ricardo Vergaz
10 February 2020 in Scientific Reports
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MEMahmoud Hamdy Elshorbagy
Mahmoud Hamdy Elshorbagy
ELEduardo López-Fraguas
Eduardo López-Fraguas
FCFateh A. Chaudhry
Fateh A. Chaudhry
JSJosé Manuel Sánchez-Pena
José Manuel Sánchez-Pena
RVRicardo Vergaz
Ricardo Vergaz
Braulio Garcia-CamaraBraulio Garcia-Camara
Braulio Garcia-Camara
The use of several layers of different materials, taking advantage of their complementary bandgap energies, improves the absorption in multi-junction solar cells. Unfortunately, the inherent efficiency increment of this strategy has a limitation: each interface introduces optical losses. In this paper, we study the effects of materials and geometry in the optical performance of a nanostructured hybrid perovskite – silicon tandem solar cell. Our proposed design increases the performance of both subcells by managing light towards the active layer, as well as by minimizing reflections losses in the interfaces. We sweep both refractive index and thickness of the transport layers and the dielectric spacer composing the metasurface, obtaining a range of these parameters for the proper operation of the device. Using these values, we obtain a reduction in the optical losses, in particular they are more than a 33% lower than those of a planar cell, mainly due to a reduction of the reflectivity in the device. This approach leads to an enhancement in the optical response, widens the possibilities for the manufacturers to use different materials, and allows wide geometrical tolerances.