Shallow silicon sub-wavelength grating waveguide for electro-optical modulation

Fouad, Nourhan; Badr, M. M.; Fedawy, Mostafa; Swillam, Mohamed A.

doi:10.1016/j.optcom.2020.126098

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…Nowadays, periodic diffraction has played an important role in many fields of engineering, especially in optoelectronic systems. For instance, it can be used in laser systems [1][2][3][4], optical communication systems [5][6][7], optical detection [8][9][10][11], and so on. Different parameters of the grating and incident conditions can cause different performance of the grating.…”

Section: Introductionmentioning

confidence: 99%

Pencil-like periodic ridges under second Bragg incidence as dual-function beam separation

Lin

Wang

2021

Laser Phys.

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A reflective dual-function pencil-like grating under second Bragg incidence is proposed in this paper. The finite element analysis method is chosen to be the research technique of this grating. Based on it, the influence of the incident angle, period, duty cycle, incident wavelength, and other parameters on the diffraction efficiency are analyzed in detail. At an incident laser wavelength of 1.55 μm, for TE polarization, the efficiency of −2nd order is 96.57% so that the proposed grating can be regarded as a single-port high-efficiency reflective grating. For TM polarization, the grating can function as a dual-port grating with the efficiency 46.03% for 0th order and 45.96% for −2nd order. What is more, the proposed grating has a broader angular bandwidth compared with other dual-function gratings, which ensures the diffraction performance of the grating while allowing some operational changes.

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Section: Introductionmentioning

confidence: 99%

Pencil-like periodic ridges under second Bragg incidence as dual-function beam separation

Lin

Wang

2021

Laser Phys.

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High birefringence photonic crystal fiber for glucose sensing

Sewidan,

Othman,

Swillam

2023

Opt Quant Electron

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This paper focuses on designing a simple photonic crystal fiber (PCF) biosensor. The proposed glucose sensor is modelled by Lumerical software using the finite element method. To evaluate the efficiency of this model, different sensing properties such as birefringence, coupling length, and relative sensitivity are calculated at different air-filling fractions. The principle of this PCF is to detect the variations in the refractive index of the different concentration glucose solutions. The analyte will be injected into an elliptical channel surrounded by two rings of air holes in a hexagonal shape. Numerical simulations show that increasing the air-filling fraction yields high performance and more light confinement. At the air-filling fraction of 0.45, the maximum birefringence and relative sensitivity were 4.01 × 10−3 and 91%, respectively. Also, the coupling length reaches a minimum of 162.09 μm.

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Shallow silicon sub-wavelength grating waveguide for electro-optical modulation

Cited by 2 publications

References 43 publications

Pencil-like periodic ridges under second Bragg incidence as dual-function beam separation

Pencil-like periodic ridges under second Bragg incidence as dual-function beam separation

High birefringence photonic crystal fiber for glucose sensing

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