Guided-mode triggered switching between TE orders of a metal-based grating-waveguide

Parriaux, Ο.

doi:10.2971/jeos.2015.15040

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Such a configu-ration could consist of a binary grating fabricated in a high RI material illuminated through its backside. Theoretical studies were initiated for this configuration [174,175], but it has not yet been experimentally demonstrated. That could be an interesting avenue to explore to enhance the performance currently achieved.…”

Section: Discussionmentioning

confidence: 99%

Development of a new plasmonic transducer for the detection of biological species

Laffont

Crespo‐Monteiro

Berini

et al. 2022

Optical Sensing and Detection VII

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During the COVID-19 outbreak, PCR tests were widely used for large-scale testing and screening.Yet, this technique requires bulky and time-consuming procedures to prepare the samples collected from the patients before their analysis by well-trained experts with expensive and specific equipment. PCR is therefore not competitive as a technique of detection for a widespread and rapid use in point-of-care sites. Thus, the COVID-19 pandemic highlighted the need for cheap and easy-to-implement biosensors. Surface plasmon resonance based sensors were suggested as a promising alternative in recent years. Indeed, they enable real-time and label-free detection of a wide range of analytes. That explains their widespread use in various fields of applications such as pharmacology, toxicology, food safety, and diagnosis. This thesis proposes and demonstrates a new plasmonic configuration of detection, which can address challenges posed by point-of-care settings. The gratings used as transducers in this configuration were fabricated based on laser interference lithography combined with a nanoimprinting process. The responses of these nanostructures interrogated by a p-polarized light beam result in a transfer of energy between two diffracted orders over an angular scan. This optical phenomenon termed as "optical switch", was theoretically and experimentally investigated and optimized.The principle of detection based on this specific configuration was demonstrated for the detection of small variations in the bulk refractive index with solutions comprised of different ratios v Abstract of de-ionized water and glycerol. A limit of detection in the range of 10 −6 RIU was achieved.In addition, preliminary bio-assays obtained by combining this configuration with a functionalization are presented and demonstrate the selectivity and the potential of this new plasmonic configuration for biosensing applications. This thesis work paves the way for the use of the optical switch configuration as a biosensor aligned with low-cost manufacturing and relevant for diagnosing in point-of-care sites. vi List of Figures 1.4 Sketches of the sequential steps for an ELISA assay consisting in detecting and quantifying gentamicin (red Y). A solution with a high gentamicin concentration results in a clearer solution than a solution with a low gentamicin concentration. That manifests through a lower (resp. higher) absorbance for high (resp. low) gentamicin concentrations, as shown in Figure 1.3. These sketches are extracted from [23].

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Section: Discussionmentioning

confidence: 99%

Development of a new plasmonic transducer for the detection of biological species

Laffont

Crespo‐Monteiro

Berini

et al. 2022

Optical Sensing and Detection VII

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“…It was checked in [14] that the existence of such switching effect as in figure 2(c) does not rely upon the surface wave being a plasmon mode: a corrugated dielectric waveguide on a metal mirror with a loss-reducing buffer layer in-between exhibits the same effect for both TE and TM polarizations with a reduction of absorption loss. It is therefore expected that the same effect exists in the present structure where the role of the metal or multilayer mirror is played by total internal reflection for all diffraction orders with the interesting specific characteristic that the effect is now strictly lossless.…”

Section: Diverted Kretschmann Coupling Mountmentioning

confidence: 99%

“…The last condition is inherently satisfied if the surface wave is a surface plasmon at a metal surface. It can also be satisfied as shown in [14] if the surface wave is the TE or TM mode of a mirror-based dielectric slab grating waveguide. The purpose of the present contribution to the field of high-contrast resonant diffractive phenomena is to disclose yet another, strictly lossless version of the same switching principle that forbids the propagation of transmitted orders without resorting to a mirror, and which lends itself to a particularly simple monolithic implementation.…”

Section: Introductionmentioning

confidence: 98%

Lossless 0th and −1st order switching by dual-excitation of grating waveguide mode

Parriaux¹,

Jourlin²

2019

J. Opt.

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The reflected 0th and −1st diffraction orders of a waveguide grating can be switched between 0 and 1 diffraction efficiency upon the excitation of a forward- and backward-propagating waveguide mode by means of the +1st and −2nd orders. Such mode-coupling trigger of high isolation switching is found to be in the neighborhood of the −1st order Littrow condition under the condition that no transmitted order can propagate; the condition is here fulfilled without loss penalty by reflecting them under total internal reflection. This requires a waveguide refractive index larger than 3, and resorting to a semiconductor in the near infrared. This non-Fano phenomenon is yet another feature of resonant gratings. The reflective switching effect lends itself to a stable monolithic implementation, and can be used for wavelength control, or for the evanescent wave sensing of measurands in the transmission medium.

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“…Recently, a new surface plasmon detection configuration termed the “optical switch” [ 23 , 24 , 25 ] was proposed and justified theoretically [ 26 ] as a promising method of detection based on a grating coupler. This approach involves monitoring two diffracted orders, the

st and the 0th diffracted orders, produced by the interaction of an incident light beam with a deep metal grating.…”

Section: Introductionmentioning

confidence: 99%

Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration

Laffont

Crespo‐Monteiro

Valour

et al. 2023

Sensors

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A new plasmonic configuration is proposed for application in a sensor and demonstrated for the detection of variations in the bulk refractive index of solutions. The configuration consists of monitoring two diffracted orders resulting from the interaction of a TM-polarized optical beam incident on a grating coupler, operating based on an effect termed the “optical switch”. The two monitored diffracted orders enable differential measurements which cancel the drift and perturbations common to both, leading to an improved detection limit, as demonstrated experimentally. The measured switch pattern associated with the grating coupler is in good agreement with theory. Bulk sensing is demonstrated under intensity interrogation via the sequential injection of solutions comprised of glycerol in water into a fluidic cell. A limit of detection of about 10−6 RIU was achieved. The optical switch configuration is easy to implement and is cost-effective, yielding a highly promising approach for the sensing and the real-time detection of biological species.

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Guided-mode triggered switching between TE orders of a metal-based grating-waveguide

Cited by 3 publications

References 4 publications

Development of a new plasmonic transducer for the detection of biological species

Development of a new plasmonic transducer for the detection of biological species

Lossless 0th and −1st order switching by dual-excitation of grating waveguide mode

Differential Sensing with Replicated Plasmonic Gratings Interrogated in the Optical Switch Configuration

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