[INVITED] Subwavelength structures for silicon photonics biosensing

Wangüemert‐Pérez, J. Gonzalo; Hadij‐ElHouati, Abdelfettah; Sánchez‐Postigo, Alejandro; Leuermann, Jonas; Xu, Dan‐Xia; Cheben, Pavel; Halir, Robert; Molina-Fernández, Í.

doi:10.1016/j.optlastec.2018.07.071

Cited by 93 publications

(49 citation statements)

References 68 publications

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“…3(a)-(c) confirm that c and S mode are directly related, as both the parameters exhibit similar dependency on the geometrical parameters W s , s and δ. Although the SWGS structure is designed on an SOI platform with 220 nm-thick device layer, we observe a significant enhancement of S mode for slightly thicker device layers, confirming a recent investigation carried out in SWG waveguides [22]. Fig.…”

Section: Mode Sensitivity Analysissupporting

confidence: 88%

Mode Sensitivity Analysis of Subwavelength Grating Slot Waveguides

et al. 2019

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In this paper, we investigate the mode sensitivity (S mode) of subwavelength grating slot (SWGS) waveguides. S mode is an important parameter in various waveguide-based photonic circuits such as sensors, modulators, and thermally-controlled devices. It is a measure of the sensitivity of the waveguide effective index towards the refractive index perturbations in the cladding medium. The SWGS waveguide exhibits high mode sensitivity, as it combines sensitivity enhancement features of both slot and subwavelength grating waveguides. Finite-difference time-domain simulations are performed for the analysis, design, and optimization of the hybrid structure. The SWGS waveguide is incorporated into a Mach-Zehnder interferometer and fabricated on a silicon-on-insulator platform for the experimental estimation of S mode. The measured S mode value of 79% is consistent with the theoretical prediction of 83%.

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Section: Mode Sensitivity Analysissupporting

confidence: 88%

Mode Sensitivity Analysis of Subwavelength Grating Slot Waveguides

et al. 2019

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“…A comparative analysis of the sensing capabilities of suspended waveguides, together with a study of leakage loss for both polarisations, can be found in Ref. [19].…”

Section: Interconnecting Waveguidesmentioning

confidence: 99%

Mid‐infrared suspended waveguide platform and building blocks

Sánchez‐Postigo

Wangüemert‐Pérez

Penadés

et al. 2019

IET Optoelectronics

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In this work we present our recent progress in the development of a platform for the mid-infrared wavelength range, based on suspended silicon waveguides with subwavelength metamaterial cladding. The platform has some intrinsic advantages, which make it a very promising candidate for sensing applications in the molecular fingerprint region. Specifically, it can cover the full transparency window of silicon (up to a wavelength of 8 μm), only requires one lithographic etch-step and can be designed for strong light-matter interaction. Design rules, practical aspects of the fabrication process and experimental results of a complete set of elemental building blocks operating at two very different wavelengths, 3.8 μm and 7.7 μm, are discussed. Propagation losses as low as 0.82 dB/cm at λ0 = 3.8 μm and 3.1 dB/cm at λ0 = 7.7 μm are attained for the interconnecting waveguides.

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“…Using the additional degree of freedom afforded by a shift, ξ, between the loading segments this approach has enabled the demonstration of filter bandwidths as narrow as 200pm with 30dB extinction [11]. The enhanced modal interaction can also be exploited to improve the sensitivity of photonic biosensors [12], which through careful design of the complete sensing system will result in better detection limits [13].…”

Section: High Performance Subwavelength Devicesmentioning

confidence: 99%