Dispersion characteristics of SOI-based slot optical waveguides

Zhang, Zheng; Iqbal, Muddassir; Liu, Jiansheng

doi:10.1016/j.optcom.2008.07.003

Cited by 49 publications

(14 citation statements)

References 17 publications

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“…In Fig. 32 The finite-difference time-domain (FDTD) simulation values for different wavelengths for a waveguide having dimensions w ¼ 436 nm, h ¼ 247 nm, n h ¼ 3.48, and n c ¼ 1.46 given in Ref. As discussed, the quasi-TE mode suffers a strong discontinuity at the interface of two media having high refractive index variation as is evident from the profile shown.…”

Section: Resultsmentioning

confidence: 97%

Semianalytical method to study silicon slot waveguides for optical sensing application

Majumder

Chakraborty

2013

Opt. Eng

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High-index contrast slab and slot optical waveguides have a high index variation both along the lateral and vertical interfaces and are usually analyzed numerically, requiring large computer memory and time. In this article, their analysis is done semianalytically using an effective-index based matrix method. This method, which is computationally very fast, was earlier used successfully for low-index profile waveguide structures only and is now suitably modified for use in high-index contrast structures. The electric field profile of the waveguide structures is plotted and the effective refractive index at different wavelengths is calculated. The results are compared with results obtained from numerical techniques like finite element method, finite-difference time-domain, and beam propagation method and they match very well. The dependence of their different optical characteristics with the waveguide parameters is also studied. These studies will help in obtaining improved sensitivity of slot waveguides for sensing applications. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 107102-3 October 2013/Vol. 52(10) Majumder and Chakraborty: Semianalytical method to study silicon slot waveguides for optical sensing application Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms Optical Engineering 107102-7 October 2013/Vol. 52(10) Majumder and Chakraborty: Semianalytical method to study silicon slot waveguides for optical sensing application Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 05/16/2015 Terms of Use: http://spiedl.org/terms

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Section: Resultsmentioning

confidence: 97%

Semianalytical method to study silicon slot waveguides for optical sensing application

Majumder

Chakraborty

2013

Opt. Eng

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“…Relative to many nonlinear materials such as SRO, SRN, chalcogenides, and polymers, silicon has a sufficiently large index to form a slot waveguide [47][48][49][50][51]. Moreover, adding a slot layer provides more design freedom to tailor chromatic dispersion, as reported in standard slot waveguides [51][52][53][54][55][56][57][58] and strip/ slot hybrid waveguides [59][60][61][62][63]. A high refractive index is also beneficial to build a slow light element with reduced group velocity of light, which can effectively increase optical length for nonlinear interactions and reduce power requirement [64][65][66].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

et al. 2014

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Group IV photonics hold great potential for nonlinear applications in the near-and mid-infrared (IR) wavelength ranges, exhibiting strong nonlinearities in bulk materials, high index contrast, CMOS compatibility, and cost-effectiveness. In this paper, we review our recent numerical work on various types of silicon and germanium waveguides for octave-spanning ultrafast nonlinear applications. We discuss the material properties of silicon, silicon nitride, silicon nano-crystals, silica, germanium, and chalcogenide glasses including arsenic sulfide and arsenic selenide to use them for waveguide core, cladding and slot layer. The waveguides are analyzed and improved for four spectrum ranges from visible, near-IR to mid-IR, with material dispersion given by Sellmeier equations and wavelength-dependent nonlinear Kerr index taken into account. Broadband dispersion engineering is emphasized as a critical approach to achieving on-chip octavespanning nonlinear functions. These include octave-wide supercontinuum generation, ultrashort pulse compression to sub-cycle level, and mode-locked Kerr frequency comb generation based on few-cycle cavity solitons, which are potentially useful for next-generation optical communications, signal processing, imaging and sensing applications.

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“…Different sensing platforms, such as interferometers [3,4], surface plasmon resonances [5,6], guided-mode resonances [7][8][9], photonic crystals [10], Bragg gratings [11,12] and microring resonators [13][14][15] have been investigated. Although conventional strip or rib waveguides are commonly employed in these integrated optical sensors, the slot waveguide formed by placing two strip waveguides in parallel with a nanometer gap (slot) has drawn more and more interest due to its high confinement of electric fields in low refractive index materials [16][17][18]. In fact, a great variety of optical devices utilizing slot waveguide structures have been designed and proposed, including directional couplers [19], optical filters [20][21][22], optical modulators [23], optical switches [24], electrically pumped light-emitting devices, [25] and microring resonators [26].…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive compact refractive index sensor based on phase-shifted sidewall Bragg gratings in slot waveguide

Wang

Madsen

2013

Appl. Opt.

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The geometrical and physical parameters of phase-shifted sidewall Bragg gratings in a silicon slot waveguide are optimized to possess performance characteristics desirable for integrated optical sensors. By tailoring the spectral response of such phase-shifted sidewall gratings, highly sensitive compact refractive index sensors detecting the resonance wavelength shift or the variation of light intensity are designed with the transfer matrix method. Both refractive index sensors have a minimum detection limit on the order of 10(-6), and a linear response and a compact structure dimension as small as 11.7 μm, offering the capabilities for sensor array and lab-on-a-chip integration. The resonance-shift sensor has a much wider detection range of 1.32 refractive index units than the intensity-measurement sensor. The performance parameters are compared with other refractive index sensors, including Mach-Zehnder interferometers, ring resonators, surface gratings, and phase-shifted gratings in silicon nanowire.

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Dispersion characteristics of SOI-based slot optical waveguides

Cited by 49 publications

References 17 publications

Semianalytical method to study silicon slot waveguides for optical sensing application

Semianalytical method to study silicon slot waveguides for optical sensing application

Nonlinear Group IV photonics based on silicon and germanium: from near-infrared to mid-infrared

Highly sensitive compact refractive index sensor based on phase-shifted sidewall Bragg gratings in slot waveguide

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