Refractive index sensor based on slot waveguide cavity

Cosentino, Armando; Tan, Qing; Roussey, Matthieu; Herzig, Hans Peter

doi:10.2971/jeos.2012.12039

Cited by 9 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bulk sensitivity values obtained by our simulations are only 40% lower than the result shown in [4] where a periodic array of PSWC is used on top of a slab waveguide which also has a 30 times larger interaction volume. As the goal of this sensor is to detect the binding of small molecules to its surface, a high bulk sensitivity might create a lot of noise to the detection e.g.…”

Section: Bulk and Local Sensitivitycontrasting

confidence: 71%

“…In this paper we propose a geometry, based on a plasmonic slot waveguide cavity, that enables a significant improvement of highly multiplexed detection on an integrated silicon platform [4,5]. Due to the large enhancement of the electromagnetic field by the SPP, the sensing volume is highly reduced, which allows localized detection of molecules in sub-attoliter volumes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

Osowiecki¹,

Barakat²,

Naqavi³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

Abstract:We propose and study an integrated refractive index sensor which is based on a plasmonic slot waveguide cavity. In this device, a guided mode supported by a silicon photonic wire waveguide is vertically coupled to a metal-dielectric-metal cavity separated by a silicon oxide spacer. We perform an in-depth study that links the geometrical parameters of the sensor to the coupling mechanism and sensitivity of the plasmonic slot waveguide cavity. Simulation results promise that local changes of refractive index can be measured with a high sensitivity of around 600 nm/RIU in a femto-liter volume. These results are obtained with threedimensional time and frequency domain simulations. Thanks to the high field enhancement in the slot of the plasmonic cavity, a high local sensitivity to changes of refractive index is obtained. Moreover, the high level of achieved decoupling between the bulk and the local sensitivity complies well with the requirements of biomolecular sensing.

show abstract

Section: Bulk and Local Sensitivitycontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

Osowiecki¹,

Barakat²,

Naqavi³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Having this aim in mind, here we present a theoretical study of a refractive index sensor which is based on a plasmonic slot waveguide cavity (PSWC) excited by a photonic wire waveguide sustaining a single mode. In this manuscript we search for a stronger localization than introduced in our previous work which was a PSWC array excited with a slab waveguide 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Localized biomolecular sensing enabled through plasmonic nanocavities

Osowiecki

Barakat

Naqavi

et al. 2014

Biophotonics: Photonic Solutions for Better Health Care IV

View full text Add to dashboard Cite

We propose and study an integrated refractive index sensor which is based on a plasmonic slot cavity integrated on silicon-on-insulator wafers. In this device, the guided mode is vertically coupled to the cavity which is a metal-dielectricmetal waveguide and is separated from a photonic wire waveguide by a silicon dioxide spacer. We perform an in-depth study that links the geometrical parameters to the coupling and sensitivity. The strong coupling from the dielectric waveguide to the plasmonic slot waveguide cavity allows a local change in refractive index to be detectable with a high sensitivity of around 600 nm/RIU in a femto-liter volume. These results are obtained with three-dimensional time domain simulations made with the CST Microwave Studio. The sensing performance of the devices are presented and compared to the practical needs to achieve localized biomolecular sensing.

show abstract

“…Since the first report of the SWG by Lipson [5], world-wide efforts have been made in investigating SWG for various applications, notably in nonlinear effect enhancement [6,7] and highly sensitive sensors [8,9]. Most often, SWG is combined with active materials such as EO polymers or with photonic crystals (PhCs) in order to obtain the desired functionalities.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the nanometric size, SWG oftentimes combines with 1D PhC Bragg gratings to design active optical components. In [8], a gold film slot Bragg grating on a silicon WG is proposed as a refractive index sensor with a sensitivity of 730 nm∕RIU. Wang et al experimentally demonstrated a phased-shifted Bragg grating with a quality factor up to 3 × 10 4 fabricated by a CMOS-compatible fabrication technique [9].…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact on-chip slot Bragg grating structure for small electric field detection

Qiu

Baida

et al. 2017

Photon. Res.

View full text Add to dashboard Cite

In this paper, we present an ultra-compact 1D photonic crystal (PhC) Bragg grating design on a thin film lithium niobate slot waveguide (SWG) via 2D-and 3D-FDTD simulations. 2D-FDTD simulations are employed to tune the photonic bandgap (PBG) size, PBG center, cavity resonance wavelength, and the whole size of PhC. 3D-FDTD simulations are carried out to model the real structure by varying different geometrical parameters such as SWG height and PhC size. A moderate resonance quality factor Q of about 300 is achieved with a PhC size of only 0.5 μm × 0.7 μm × 6 μm. The proposed slot Bragg grating structure is then exploited as an electric field (E-field) sensor. The sensitivity is analyzed by 3D-FDTD simulations with a minimum detectable E-field as small as 23 mV∕m. The possible fabrication process of the proposed structure is also discussed. The compact size of the proposed slot Bragg grating structure may have applications in on-chip E-field sensing, optical filtering, etc.

show abstract

Refractive index sensor based on slot waveguide cavity

Cited by 9 publications

References 22 publications

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

Localized biomolecular sensing enabled through plasmonic nanocavities

Ultra-compact on-chip slot Bragg grating structure for small electric field detection

Contact Info

Product

Resources

About