Porous silicon microcavities as optical chemical sensors

Mulloni, Viviana; Pavesi, L.

doi:10.1063/1.126396

Cited by 208 publications

(138 citation statements)

References 11 publications

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“…Label-free sensors are important, not only because they avoid expensive and laborious labeling steps, but also because the labels may affect the biochemical recognition. So far, various label-free (bio) chemical sensors have been demonstrated, capable of measuring the refractive index change of the environment with high resolution [1][2][3][4][5][6][7]. The most developed sensors are the Surface Plasmon Resonance [1] and Mach-Zehnder interferometer [2,3] based devices, that require a large sensing area (~mm 2 ) which is one of the main limitations for integrating these sensors in optical chips.…”

Section: Introductionmentioning

confidence: 99%

Sensitivities of InGaAsP photonic crystal membrane nanocavities to hole refractive index

Dündar¹,

Ryckebosch²,

Nötzel³

et al. 2010

Opt. Express

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Dundar, M.A.; Ryckebosch, E.C.I.; Nötzel, R.; Karouta, F.; van IJzendoorn, L.J.; van der Heijden, R.W. Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

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Section: Introductionmentioning

confidence: 99%

Sensitivities of InGaAsP photonic crystal membrane nanocavities to hole refractive index

Dündar¹,

Ryckebosch²,

Nötzel³

et al. 2010

Opt. Express

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“…Highly doped (10 19 cm -3 ) p-or n-silicon anodized in aqueous HF solution usually forms mesopores with pore sizes from 20 nm to 50 nm (Figure 4 (a)). Several groups have demonstrated that complex optical devices can be designed with mesoporous silicon (Mulloni & Pavesi, 2000). In the case of lightly doped (below ~10 18 cm -3 ) p-type silicon, the porous size distribution is normally found in the range 1 -5 nm, in the lower limit for mesopores (Figure 4 (b)).…”

Section: Porous Silicon Morphologymentioning

confidence: 99%

Porous Silicon Integrated Photonic Devices for Biochemical Optical Sensing

Orabona¹,

Rendina²,

Stefano³

et al. 2011

Crystalline Silicon - Properties and Uses

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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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Porous silicon microcavities as optical chemical sensors

Cited by 208 publications

References 11 publications

Sensitivities of InGaAsP photonic crystal membrane nanocavities to hole refractive index

Sensitivities of InGaAsP photonic crystal membrane nanocavities to hole refractive index

Porous Silicon Integrated Photonic Devices for Biochemical Optical Sensing

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

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