Optical sensor based on resonant porous silicon structures

Saarinen, Jarkko J.; Weiss, Sharon M.; Fauchet, Philippe M.; Sipe, J. E.

doi:10.1364/opex.13.003754

Cited by 90 publications

(47 citation statements)

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“…Moreover, since the largest magnitude change in the optical spectrum is due to a refractive index change in the central layer of the resonant cavity, a larger volume of biological material is needed to ensure sufficient infiltration and binding. Recently, a new sensor structure has been proposed, where a resonant PSi waveguide consisting of two PSi thin film layers is constructed and biomolecules are infiltrated into the porous waveguide [8]. The detection mechanism is a resonance angle shift that occurs when infiltrated biomolecules cause an effective refractive index change of the PSi waveguide.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Sensor Based on Porous Silicon Waveguide

et al. 2006

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Porous silicon (PSi) waveguides are fabricated as a new platform for high sensitivity biosensors. Biomolecules infiltrated into the PSi waveguide increase the effective refractive index of the waveguide and change the angle at which incident light couples into a waveguide mode. Due to the high surface area to volume ratio of PSi and the confinement of optical energy in the region where the biomolecules reside, the waveguide resonance is very sensitive to small concentrations of infiltrated molecular species. A resonance width below 0.1˚ has been obtained, which is sufficient to detect one monolayer of DNA covering the pore walls. In this work, a prism is used for the waveguide coupling in an arrangement that is similar to traditional surface plasmon resonance (SPR) sensing. Theoretical analysis suggests that an optimized PSi waveguide resonant sensor will show a 60-fold improvement in sensitivity when compared to a conventional SPR sensor due to the enhanced interaction between the electromagnetic field and biological material.

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Section: Introductionmentioning

confidence: 99%

High Sensitivity Sensor Based on Porous Silicon Waveguide

et al. 2006

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“…Efficiency-bandwidth product EBP plotted as a function of pump intensity and cavity quality factor given V n =0. 26 and q dye =0.1%.…”

Section: Optimization Of Nanocavity Quality Factormentioning

confidence: 93%

“…46,47 In our work, the designed PC nanoslot cavity (to be elaborated in the next section) features a 6000-fold increase of dye lifespan, and so a photobleaching time as long as one day can be obtained under continuous wave pump intensity of 10 2 W/cm 2 . Note that while such a number is sufficient for applications where only a short operation time is needed, 26 for applications demanding a long operation time 25 flowing configuration with dye jet should be introduced to keep replenishing the quenched dye molecules. 48,49 …”

Section: Optimization Of Nanocavity Quality Factormentioning

confidence: 99%

“…24 The purpose of this paper is to investigate the feasibility of constructing a silicon-based cavity light source that is capable of a high-speed operation in an energy-efficient fashion, which may find new applications on low-cost integrated silicon photonics platforms. 25,26 A cavity light source comprising silicon L0 PC nanoslot cavity immersed in organic fluid Dichloromethane containing NIR dyes IR-26 27 operating at 1.19 µm (252 THz) is considered. By filling the nanoslot with a gain medium consisting of organic fluid and NIR dyes, the light-matter interaction can be strongly enhanced in which an energy-efficient, high-speed operation becomes possible.…”

Section: Introductionmentioning

confidence: 99%

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Optical properties of organic-silicon photonic crystal nanoslot cavity light source

Yang

Lin

et al. 2017

AIP Advances

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We theoretically study a dielectric photonic crystal nanoslot cavity immersed in an organic fluid containing near-infrared dyes by means of a full rate equation model including the complete cavity QED effects. Based on the modeling results, we numerically design an organic-silicon cavity light source in which its mode volume, quality factor, and far-field emission pattern are optimized for energy-efficient, high-speed applications. Dye quantum efficiency improved by two orders of magnitude and 3dB modulation bandwidth of a few hundred GHz can be obtained.

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“…Optical sensors based on porous mono/double layers, Bragg mirrors, luminescent and reflective microcavities (MCs) have been reported in literature. [16,[35][36][37][38][39][40] Also, it should be noted that TNT detection with the use of a PSi microcavity infiltrated with a fluorescent sensory polymer has previously been studied. [16] All the above features of PSi are critical for detection of trace levels of explosives, such as TNT and cyclotrimethylenetrinitramine (RDX), which exhibit very low pressures of saturated vapours (in the ppb to ppt range).…”

Section: Introductionmentioning

confidence: 99%

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

McLeod¹,

Kurmaev²,

Sushko³

et al. 2012

Chemistry A European J

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We demonstrate that the electronic structure of mesoporous silicon is affected by adsorption of nitro-based explosive molecules in a compoundselective manner. This selective response is demonstrated by probing the adsorption of two nitro-based molecular explosives (trinitrotoluene and cyclotrimethylenetrinitramine) and a nonexplosive nitro-based aromatic molecule (nitrotoluene) on mesoporous silicon using soft X-ray spectroscopy. The Si atoms strongly interact with adsorbed molecules to form Si-O and Si-N bonds, as evident from the large shifts in emission energy present in the Si L2,3 X-ray emission spectroscopy (XES) measurements. Furthermore, we find that the energy gap of mesoporous silicon changes depending on the adsorbant, as estimated from the Si L2,3 XES and 2p Xray absorption spectroscopy (XAS) measurements. Our ab initio molecular dynamics calculations of model compounds suggest that these changes are due to spontaneous breaking of the nitro groups upon contacting surface Si atoms. This compound-selective change in electronic structure may provide a powerful tool for the detection and identification of trace quantities of airborne explosive molecules.

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Optical sensor based on resonant porous silicon structures

Cited by 90 publications

References 0 publications

High Sensitivity Sensor Based on Porous Silicon Waveguide

High Sensitivity Sensor Based on Porous Silicon Waveguide

Optical properties of organic-silicon photonic crystal nanoslot cavity light source

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

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