Competitiveness of the BPM in studying the optical beams at critical incidence on dielectric interfaces

Gomaa, Lotfy Rabeh; Shaaban, Adel; Hameed, Mohamed Farhat O.; Obayya, S. S. A.

doi:10.1007/s11082-016-0886-2

Cited by 13 publications

(7 citation statements)

References 25 publications

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“…The integration of plasmon-based device with active and passive plasmonic components has led to fundamental new concepts in the design and implementation of innovative applications in our daily life [ 19 , 22 – 28 ]. However, the measurements of guided optical power in plasmonic waveguides were achievable only via optical means [ 29 ] until recently Peal et.…”

Section: Introductionmentioning

confidence: 99%

An Optical Universal Plasmon-Based Biosensor for Virus ‎‎Detection

Shaaban¹

2023

J. Med. Biol. Eng.

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Purpose Kretschmann-configuration has been used as a subwavelength framework to detect tiny ‎alterations of the refractive index of biomaterials. However, most of the theoretical assessment of such configuration ‎is usually based on the plane wave excitation transfer matrix method (TMM) of prism-‎coupled to thin metal film supporting plasmonic modes. Accordingly, a better theoretical framework ‎than the plane wave approximation is indispensable for reliable and accurate assessments and ‎simulations. A reformulated form of the traditional FFT-BPM has been adapted to evaluate the performance and characteristics of surface plasmonic waveguide biosensor. Method Surface plasmon mode is excited by a sub-wavelength narrow light beam. The highly confined optical energy of that plasmonic mode enables an ‎efficient means to detect tiny variations in the composition of ‎the analyte in contact with the metallic layer of the surface plasmon ‎guide. The plasmonic guided power is detected thereafter electronically via an optical MOS capacitor. Results the guided plasmonic power has been used to assess the fundamental characteristics and performance of the sensor, namely the linearity, sensitivity, and figure of merit as well as the full width at half maximum (FWHM). Conclusion The proposed sensor could be integrated to a wide class of angular measurement system (for instance goniometer) or via electronic detection of the optical plasmonic guided power. we claim that this work is worthy of being shared with researchers and ‎developers interested in the experimentation and assessment of sensitive biosensors; especially in ‎case when complicated and sophisticated analysis tools represent an unpleasant burden.

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Section: Introductionmentioning

confidence: 99%

An Optical Universal Plasmon-Based Biosensor for Virus ‎‎Detection

Shaaban¹

2023

J. Med. Biol. Eng.

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“…Especially, butt-coupling plasmonic and dielectric guides is one of the most efficient ways for light transmission between highly confined modes and low-loss guided wave structures [7]. It is worthy to note that subwavelength optical confinement modes, allows the efficient and beneficial use of compact photonic devices like nanoscale photodetectors; thus, improving noise immunity, response speed and power dissipation in optical communication devices [8,9].The versatility of the FFT-BPM in the simulation of wide range of photonic devices is well understood [10][11][12][13][14]. In this paper, for the sake of simplicity, we shall consider two-dimensional structures invariant in the y-direction.…”

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confidence: 99%

“…Concerning the step-like transverse variation of the refractive index of the dielectric and plasmonic guides, we used a sigmoid-like function to approximate such abrupt index changes. It is worthy to note that many smoothing functions could be used [10,13,16]. We adopted the sigmoid function because of its simplicity in the analytical and numerical evaluation of the second derivative of the inverse index profile in the TM wave equation.The third problem concerning the reflected field at the junction plane, we adopted a well-established, combined spatial-spectral operator formalism [12,14].In this paper, a dielectric waveguide with its end facet terminated by air is considered in two cases: with and without coating layer.…”

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confidence: 99%

“…The versatility of the FFT-BPM in the simulation of wide range of photonic devices is well understood [10][11][12][13][14]. In this paper, for the sake of simplicity, we shall consider two-dimensional structures invariant in the y-direction.…”

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confidence: 99%

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Extension of an FFT-Based Beam Propagation Method to Plasmonic and Dielectric Waveguide Discontinuities and Junctions

Shaaban

Gomaa

2019

Applied Sciences

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We adapted a fast Fourier transform-based Beam Propagation Method (FFT-BPM) to investigate waveguide discontinuities in plasmonic waveguides. The adaptation of the FFT-BPM to treat transverse magnetic (TM) fields requires the circumvention of two major difficulties: the mixed derivatives of the magnetic field and waveguide refractive index profile in the TM wave equation and the step-like index change at the transverse metal-dielectric boundary of the plasmonic guide and the transverse boundaries of the dielectric waveguide as well. An equivalent-index method is adopted to transform TM fields to transverse electric (TE) ones, thus enabling the benefit of the full power and simplicity of the FFT-BPM. Moreover, an appropriate smoothing function is used to approximate the step-like refractive index profile in the transverse direction. At the junction plane, we used an accurate combined spatial-spectral reflection operator to calculate the reflected field. To validate our proposed scheme, we investigated the modal propagation in a silicon waveguide terminated by air (like a laser facet in two cases: with and without a coating layer). Then we considered a subwavelength plasmonic waveguide (metal-insulator-metal MIM) butt-coupled with a dielectric waveguide, where the power transmission efficiency has been calculated and compared with other numerical methods. The comparison reveals good agreement.Waals materials layers (like graphene) or through multilayered heterostructures. This leads to strong nonlinearities, large photonic forces, and enhanced emission and absorption probabilities. A practical approach toward nanoscale light trapping and manipulation is offered by interfaces separating media with permittivities of opposite signs [5]. Graphene plasmons are very promising to be the best alternative to noble-metal plasmons as they exhibit much tighter confinement and relatively long propagation distances, with the advantage of being highly tunable via electrostatic gating [6].The integration of plasmonic-based devices and photonic devices will eventually lead to an interfacing between plasmomic and photonic guides. Especially, butt-coupling plasmonic and dielectric guides is one of the most efficient ways for light transmission between highly confined modes and low-loss guided wave structures [7]. It is worthy to note that subwavelength optical confinement modes, allows the efficient and beneficial use of compact photonic devices like nanoscale photodetectors; thus, improving noise immunity, response speed and power dissipation in optical communication devices [8,9].The versatility of the FFT-BPM in the simulation of wide range of photonic devices is well understood [10][11][12][13][14]. In this paper, for the sake of simplicity, we shall consider two-dimensional structures invariant in the y-direction. The main essence of the BPM is simple: propagation in a reference homogenous medium over a small distance ∆z followed by phase correction that takes into account the spatial dependence of the refractive index of the me...

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