Theoretical and experimental study of a 30 nm metallic slot array

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

doi:10.1364/josab.28.001711

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…Previous studies of this variety of nanostructures were done by Dionne et al [10] and Veronis and Fan [11] who provided a new in-sight on subwavelength slots and generation of plasmonic guidance in a few tens of nanometers in metal-insulator-metal (MIM) cavities [12]. In a previous work [13], we have shown theoretically and experimentally how the geometrical parameters of this structure affect the behavior of light in the cavity. Moreover we have proved theoretically the potential application to refractive index sensing of this device.…”

Section: Designmentioning

confidence: 93%

Refractive index sensor based on slot waveguide cavity

Cosentino¹,

Tan²,

Roussey³

et al. 2012

J. Eur. Opt. Soc.-Rapid Publ.

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The experimental study of a gold slot waveguide cavity is presented. The resonance of this cavity working in the telecom wavelength range is highly dependent on the refractive index of the medium located in or around the slots array, because of the high confinement of the electromagnetic field in the structure. We will demonstrate the application of this structure to local refractive index sensors at the nanoscale. The measured sensitivity of this device is S = 730 nm/RIU (refractive index unit). The structure has been optimized by adding another array of slots cascaded with the first one. The consequence is an improvement in the time efficiency of the experiments. A discussion about the effect of the volume of liquids used and the filling percentage of the slots by the liquids is also presented as parameters affecting the measurements and the sensitivity of the sensor.

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Section: Designmentioning

confidence: 93%

Refractive index sensor based on slot waveguide cavity

Cosentino¹,

Tan²,

Roussey³

et al. 2012

J. Eur. Opt. Soc.-Rapid Publ.

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“…Furthermore, disk or ring resonators have shown promising results in terms of sensitivity [around 600 nm∕RIU (refractive index unit)], with the advantage of planar integration on chips [12,13]. Since a high field localization has been demonstrated in the narrow dielectric region of the metal/ dielectric/metal aperture [14] and thanks to our recent result obtained with slot waveguide cavity [15], we propose here to investigate the behavior of the electromagnetic field inside coaxial apertures when illuminated in-plane. It appears as a combination of high transmission and planar optics with strong field localization, which should provide a high sensitivity associated to a local interaction with the measured medium.…”

mentioning

confidence: 93%

In-plane illuminated metallic annular aperture array for sensing application

et al. 2012

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We propose here an application to sensing of annular aperture arrays (AAA). We theoretically investigate the optical properties of the reflective AAA device when illuminated in-plane. The cavity presents almost perfect absorption due to the waveguide mode resonance with strong field localization in the aperture. Additionally, the reflective cavity is modeled to be available for on-chip sensing with a theoretically expected sensitivity of 764 nm∕RIU (refractive index unit , we propose here to investigate the behavior of the electromagnetic field inside coaxial apertures when illuminated in-plane. It appears as a combination of high transmission and planar optics with strong field localization, which should provide a high sensitivity associated to a local interaction with the measured medium. In this Letter, the integration of these nanostructures is considered for embedment in waveguides. Figure 1 presents the schematic view of three periods of the studied structure. It consists of one row of annular holes in a block of gold (Au) embedded on a silicon nitride (Si 3 N 4 ) waveguide. The different parameters are: the periodicity (p), the cut-distance (d 0 ), the inner radius (r i ), the outer radius (r e ) of the circular aperture, and the block metal thickness (d 1 ). The incident medium (Si 3 N 4

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“…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%

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

Osowiecki¹,

Barakat²,

Naqavi³

et al. 2014

Opt. Express

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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.

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Theoretical and experimental study of a 30 nm metallic slot array

Cited by 9 publications

References 20 publications

Refractive index sensor based on slot waveguide cavity

Refractive index sensor based on slot waveguide cavity

In-plane illuminated metallic annular aperture array for sensing application

Vertically coupled plasmonic slot waveguide cavity for localized biosensing applications

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