On measurements of the refractive index dispersion in Porous Silicon

Strashnikova, M. I.

doi:10.1134/1.1496736

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…The model is that or those 'mixing rule' allowing calculation of the effective permittivity of a nanocomposite on a basis of permittivities, form, and volume fraction of its constituents. Experimentally, measurement of the effective refractive index is usually carried out by means of analysis of the reflection/transmission spectra of the por-Si films [5][6][7][8][9] or by ellipsometry. [10][11][12] The detailed studies 5 13 demonstrated that the Bruggeman model 14 gives a good description of the effective permittivity of the mesoporous silicon (mesopor-Si) although other effective-medium models such as Maxwell-Garnett and Landau-Lifshits-Looyenga are also employed in some cases.…”

Section: Effective Refractive Indexmentioning

confidence: 99%

Nonlinear-Optical Properties of Porous Silicon Nanostructures

Golovan¹,

Timoshenko²

2013

Journal of Nanoelectronics and Optoelectronics

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In the present review, we consider in detail nonlinear-optical properties of porous silicon. The nonlinear-optical properties of porous silicon are discussed in close connection with its linear optical properties. Such coherent nonlinear-optical processes as the second-and third harmonic generation are considered, with special interest to the variations of the nonlinear susceptibility tensor, phase matching in the birefringent porous silicon, and effect of the photonic crystals. Incoherent nonlinear-optical processes as nonlinear refraction, optical bleaching, and two-photon absorption are also reviewed, the different mechanisms responsible for them are discussed.

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Section: Effective Refractive Indexmentioning

confidence: 99%

Nonlinear-Optical Properties of Porous Silicon Nanostructures

Golovan¹,

Timoshenko²

2013

Journal of Nanoelectronics and Optoelectronics

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“…Moreover, this research also shows the impact on the decay rate from absolute viscosity [92]. In the stilbene-based aptasensors, long chain aptamers may also act like a capsule or large molecule to enclose trans-stilbene by "adaptive binding", resulting in constrained micro-environment of stilbene and inhibition of the photoisomerization.…”

Section: Variation In Photoisomerization Of Stilbene Compoundsmentioning

confidence: 74%

“…Studies have shown that trans-cis switching of stilbenes can be affected or inhibited by various causes [86,[89][90][91]. Steric hindrance or viscous micro-environment is one of the most significant factors of this effect [89,92]. When a trans-stilbene molecule was put into a constrained capsule or was enclosed by a large molecule, photodecay kinetics were correlated to the steric hindrance (Figure 2.8) [88,89,93,94].…”

Section: Variation In Photoisomerization Of Stilbene Compoundsmentioning

confidence: 99%

Photochrome aptamer switch assay

Zhou¹

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Aptamers are known to undergo adaptive conformational change upon ligand binding, causing micro-environment rearrangements that may be linked with stilbene transducers.Stilbene displays fluorescence decay upon on continuous excitation, which is sensitive to micro-environment sterics. This thesis hypothesizes that fluorescence decay based biosensing can be achieved by incorporating the molecular recognition properties of aptamer with time-dependent stilbene trans-cis photodecay. Two designs were proposed and tested according to the hypothesis: 1) "competitive binding of stilbene-analyte conjugate with analyte" and 2) "stilbene-aptamer conjugate fluorescence decay correlates to analyte binding". Malachite green aptamer (MGA) and its ligand malachite green (MG)were chosen as a model study to test the hypothesis. Prior to hypothesis investigation, experimental conditions were established and optimized. The MGA/MG binding was found to have hydrolysis-dependent photodecay, but organic additives were found to reverse the hydrolysis and ultimately stabilize the binding. For the design 1), MG-stilbene conjugates obtained for the hypothesis testing had micromolar binding affinities with appreciable photodecay. Based on the MG-stilbene conjugates analyzed, electron Uncomplexed stilbeneThe thesis consists of the following seven chapters:Chapter 1 briefly describes the research background of the study, followed by an introduction of research motivation, hypothesis and scopes, and finally outlines the overview and outcomes of the thesis.Chapter 2 reviews the historical and state-of-the-art background of biosensors, aptamers and stilbenes, with research gaps highlighted. The advantages of aptamers and stilbenes are reviewed within a biosensor perspective. A model system, comprising of malachite green aptamer, is proposed to challenge the hypothesis above.Chapter 3 introduces the main experimental methods or techniques and their corresponding principles, including K d determination, bioconjugation, and fluorescence decay analysis.Chapter 4 refines the conditions for MGA/MG binding. pH and organic additives 2. MG-stilbene conjugates were synthesized and their binding affinities to MGA and fluorescence properties were measured for the first time, providing structure activity relationships required in ligand-stilbene aptameric biosensors. 3.MGA-stilbene conjugate was synthesized successfully, with a linear correlation of

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Refractive Index of Porous Silicon

Sohn¹

2014

Handbook of Porous Silicon

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On measurements of the refractive index dispersion in Porous Silicon

Cited by 12 publications

References 3 publications

Nonlinear-Optical Properties of Porous Silicon Nanostructures

Nonlinear-Optical Properties of Porous Silicon Nanostructures

Photochrome aptamer switch assay

Refractive Index of Porous Silicon

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