Solvent detection using porous silicon optical waveguides

Arrand, H.F.; Benson, T.M.; Loni, A.; Arens-Fischer, R.; Krueger, M.; Thoenissen, M.; Lueth, Hans; Kershaw, S. V.; Vorozov, N.

doi:10.1016/s0022-2313(98)00079-9

Cited by 51 publications

(20 citation statements)

References 5 publications

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“…Potential applications include dye-sensitized solar cells [8][9][10], low-k dielectric materials [11,12], photocatalysis [13,14], biosensors [15][16][17], optoelectronics [18][19][20], and antireflecting and self-cleaning coatings [21], to name a few. In these applications, predicting the effects of porosity and pore shape, size, and spatial arrangement on the optical and dielectric properties is essential to the design of mesoporous materials with desired performances or for material characterization purposes.…”

Section: Introductionmentioning

confidence: 99%

Effective optical properties of highly ordered mesoporous thin films

et al. 2010

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This paper expands our previous numerical studies predicting the optical properties of highly ordered mesoporous thin films from two-dimensional (2D) nanostructures with cylindrical pores to three-dimensional (3D) structures with spherical pores. Simple, face centered, and body centered cubic lattice of spherical pores and hexagonal lattice of cylindrical pores were considered along with various pore diameter and porosity. The transmittance and reflectance were numerically computed by solving 3D Maxwell's equations for transverse electric and transverse magnetic polarized waves normally incident on the mesoporous thin films. The effective optical properties of the films were determined by an inverse method. Reflectance of 3D cubic mesoporous thin films was found to be independent of polarization, pore diameter, and film morphology and depended only on film thickness and porosity. By contrast, reflectance of 2D hexagonal mesoporous films with cylindrical pores depended on pore shape and polarization. The unpolarized reflectance of 2D hexagonal mesoporous films with cylindrical pores was identical to that of 3D cubic mesoporous films with the same porosity and thickness. The effective refractive and absorption indices of 3D films show good agreement with predictions by the 3D Maxwell-Garnett and Nonsymmetric Bruggeman effective medium approximations, respectively.

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Section: Introductionmentioning

confidence: 99%

Effective optical properties of highly ordered mesoporous thin films

et al. 2010

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“…The scattering losses due to the presence of the core-cladding and core-buffer interfaces cannot be considered in the numerical calculations. Unfortunately, in a multi-components integrated structure, such as the one proposed in this work, the scattering losses are predominant in the beam propagation: the presence of a liquid phase in the cover material, the PSi in this case, increases the guiding efficiency but does not remove the scattering source as in other PSi waveguiding devices reported in literature [7]. A very different behaviour can be observed in presence of the liquid Methanol.…”

Section: Methodsmentioning

confidence: 72%

An integrated hybrid optical device for sensing applications

Stefano

Rea

Rotiroti

et al. 2007

Phys. Status Solidi (c)

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We present the design and the fabrication of an integrated hybrid optical sensor for liquid and gas sensing based on the anodic bonding technique. The device is composed by three distinct elements separately realised and then joined together: a planar SOI waveguide, a porous silicon micro-chamber and a glass slide. The presence of a liquid or gaseous substance in the reaction chamber is revealed as a change in the propagation characteristic of the guided mode. In case of exposure to methanol, the preliminary experimental results show that the propagation of the laser beam, coupled into the SOI waveguide, has been efficiently modulated.

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“…The frustration was aired at a meeting with an eminent theoretical physicist who sympathised and suggested we should instead perhaps look at group IV nanoparticles. Porous silicon had recently arrived on the scene [13] and indeed the group at BT Labs did later work on porous silicon though not principally for its emissive properties but rather its IR refractive index properties [14,15]. Heath [16] had already demonstrated a bottom-up approach to silicon nanoparticles, but with the synthesis involving sodium reduction of chloro-and organochloro-silicon precursors at 385 ∘ C, and pressures of 100 atmospheres we felt somewhat outside our synthetic comfort zone.…”

Section: Development and Considerations From Earlier Work On Hgte Qdsmentioning

confidence: 99%

Infrared Emitting HgTe Quantum Dots and Their Waveguide and Optoelectronic Devices

Kershaw

Rogach

2014

Zeitschrift Für Physikalische Chemie

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Abstract:The development of the research into the synthesis and optoelectronic applications of HgTe and related quantum dots (QDs) is reviewed, from the early days when it was felt that it might be a useful replacement for rare earths in telecom optical amplifiers, through to its more recent and broader appeal as an IR photodetector technology. Appropriately the early investigation of the material sprang from a contact with Prof. Horst Weller and his group at Hamburg University. Though the problem of Auger recombination meant that it was not so easy to make telecom amplifiers and lasers as many had hoped, it has proved to have an extraordinarily broad bandgap tuning range and just recently this has resulted in the demonstration of photodetectors in the mid-to long-IR region operating at up to 12 μm wavelength. This impressive flexibility has led to interest in HgTe QDs and optoelectronic devices based on them to be as strong as ever and growing as the prospects for commercialization improve with every narrowing in the gap between the performance of present day epitaxial devices and QD-based technology. In a further satisfying and well timed twist, Prof. Weller's 60 th year has seen preliminary reports of extended gain lifetime in 'doped' HgTe QDs which may yet lead to a completing of the circle with the distinct possibility of electrically driven telecom wavelength lasers and amplifiers in the coming years. This review follows the development of the several synthetic methods to grow colloidal HgTe QDs, and their deployment in optoelectronic devices to the present.

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Solvent detection using porous silicon optical waveguides

Cited by 51 publications

References 5 publications

Effective optical properties of highly ordered mesoporous thin films

Effective optical properties of highly ordered mesoporous thin films

An integrated hybrid optical device for sensing applications

Infrared Emitting HgTe Quantum Dots and Their Waveguide and Optoelectronic Devices

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