Sub-wavelength grating for enhanced ring resonator biosensor

Flueckiger, Jonas; Schmidt, Shon; Donzella, Valentina; Sherwali, Ahmed; Ratner, Daniel M.; Chrostowski, Lukas; Cheung, Karen C.

doi:10.1364/oe.24.015672

Cited by 214 publications

(142 citation statements)

References 49 publications

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“…Since the first experimental demonstration of an optical waveguide with a subwavelength periodic core [4], these structures, also called subwavelength gratings (SWGs), have found many applications in integrated optics, for example as highly efficient fiber-chip couplers [3][4][5][6][7][8][9], low-loss waveguide crossings, evanescent field sensors [10,11], broadband directional couplers [12] and multimode interference (MMI) [13] couplers, polarization beam splitters [14][15][16], wavelength division [4] and mode division [17] multiplexers, delay lines [18], Fourier-transform spectrometers [19] and suspended (membrane) waveguides for mid-infrared applications [20]. Exhaustive reviews of SWG fundamentals and applications can be found in [21,22].…”

Section: Introductionmentioning

confidence: 99%

Disorder effects in subwavelength grating metamaterial waveguides

et al. 2017

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. Abstract: Subwavelength grating (SWG) waveguides are integrated photonic structures with a pitch substantially smaller than wavelength for which they are designed, so that diffraction effects are suppressed. SWG operates as an artificial metamaterial with an equivalent refractive index which depends on the geometry of the structure and the polarization of the propagating wave. SWG waveguides have been advantageously used in silicon photonics, resulting in significant performance improvements for many practical devices, including highly efficient fiber-chip couplers, waveguide crossings, broadband multimode interference (MMI) couplers, evanescent field sensors and polarization beam splitters, to name a few. Here we present a theoretical and experimental study of the influence of disorder effects in SWG waveguides. We demonstrate via electromagnetic simulations and experimental measurements that even a comparatively small jitter (~5 nm) in the position and size of the SWG segments may cause a dramatic reduction in the transmittance for wide (multimode) SWG waveguides, while for narrow (single mode) waveguides this effect is negligible. Our study shows that the impact of the jitter on SWG waveguide performance is directly related to the modal confinement.

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Section: Introductionmentioning

confidence: 99%

Disorder effects in subwavelength grating metamaterial waveguides

et al. 2017

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“…4. The fitting numerical model is specially developed based on the equivalent refractive index method [14,15,26,27]. As Pitch = 350 nm is small enough, the equivalent refractive index of the lateral SWG metamaterial can be written as:…”

Section: Bgmentioning

confidence: 99%

“…Many efforts have been invested on the SOI based bio-chemical sensing in the nearinfrared (NIR) band, typically around 1.3-1.6 µm wavelength [1][2][3][4][5][6]. Various structures and methods have been utilized to achieve high sensitivity [7][8][9][10][11][12][13][14][15][16][17][18]. However, limited work has been reported on mid-infrared (MIR) sensors based on the SOI platform.…”

Section: Introductionmentioning

confidence: 99%

Suspended Microracetrack Resonator with Lateral Sub-wavelength-Grating Metamaterial Cladding for Mid-infrared Sensing Applications

Zhang

et al. 2018

ITM Web Conf.

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Abstract.A one-time etching suspended microracetrack resonator with lateral sub-wavelength-grating (SWG) metamaterial cladding is theoretically and experimentally demonstrated on commercial 340 nmthick-top-silicon silicon-on-insulator (SOI) platform for mid-infrared (MIR) bio-chemical sensing applications. The suspended structure can offer a larger exposed area of waveguides with the testing chemicals as well as a decent sensitivity. And the one-time etching process also eases the fabrication. The suspended waveguide is optimized with a balance between propagation loss and the sensitivity. The suspended microracetrack resonator is experimentally measured at 2 µm wavelength and well fitted with an extinction ratio (ER) of 12.3 dB and a full-width-at-half-maximum (FWHM) of 0.12 nm, which corresponds to a quality factor (Q factor) of 16600. With the equivalent refractive index method and a specially developed numerical model, the expected sensitivities of fundamental TE and TM mode were calculated as 58 nm/RIU and 303 nm/RIU respectively. This one-time etching suspended microracetrack resonator shows great potential in MIR optical bio-chemical sensing applications.

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“…1, 2 This principle, which was well known in free space optics, has now found widespread applications in waveguide devices, 3 with recent developments including wavelength filters, 4, 5 evanescent field sensors, 6,7 and highly efficient fiber-to-chip couplers. [8][9][10][11][12] Here we provide a short introduction on the general design of subwavelength waveguide devices (section 2), and then discuss two applications: suspended waveguides for the mid-infrared (section 3), and ultra-broadband couplers (section 4).…”

Section: Introductionmentioning

confidence: 99%

Subwavelength metamaterial engineering for silicon photonics

et al. 2017

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Waveguides structured at the subwavelength scale frustrate diffraction and behave as optical metamaterials with controllable refractive index. These structures have found widespread applications in silicon photonics, ranging from sub-decibel efficiency fibre-chip couplers to spectrometers and polarization rotators. Here, we briefly describe the design foundations for sub-wavelength waveguide devices, both in terms of analytic effective medium approximations, as well as through rigorous Floch-Bloquet mode simulation. We then focus on two novel structures that exemplify the use of subwavelength waveguides: mid-infrared waveguides and ultra-broadband beamsplitters.

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Sub-wavelength grating for enhanced ring resonator biosensor

Cited by 214 publications

References 49 publications

Disorder effects in subwavelength grating metamaterial waveguides

Disorder effects in subwavelength grating metamaterial waveguides

Suspended Microracetrack Resonator with Lateral Sub-wavelength-Grating Metamaterial Cladding for Mid-infrared Sensing Applications

Subwavelength metamaterial engineering for silicon photonics

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