Optical properties of porous silicon superlattices

Vincent, Gilbert

doi:10.1063/1.111982

Cited by 218 publications

(115 citation statements)

References 8 publications

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“…Depending on several parameters such as Si wafer dopant type and resistivity, current density, and electrolyte composition, a wie range of pore sizes and morphologies can be obtained. 14,15 In addition, the pore diameters can be systematically varied in either horizontal or vertical directions (relative to the wafer surface), leading to pore gradient 11-13 and multilayer [16][17][18] structures.…”

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confidence: 99%

Biosensing Using Porous Silicon Double-Layer Interferometers: Reflective Interferometric Fourier Transform Spectroscopy

et al. 2005

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A simple, chip-based implementation of a double-beam interferometer that can separate biomolecules based on size and that can compensate for changes in matrix composition is introduced. The interferometric biosensor uses a double-layer of porous Si comprised of a top layer with large pores and a bottom layer with smaller pores. The structure is shown to provide an on-chip reference channel analogous to a double-beam spectrometer, but where the reference and sample compartments are stacked one on top of the other. The reflectivity spectrum of this structure displays a complicated interference spectrum whose individual components can be resolved by fitting of the reflectivity data to a simple interference model or by fast Fourier transform (FFT). Shifts of the FFT peaks indicate biomolecule penetration into the different layers. The small molecule sucrose penetrates into both porous Si layers, whereas the large protein bovine serum albumin (BSA) only enters the large pores. BSA can be detected even in a large (100-fold by mass) excess of sucrose from the FFT spectrum. Detection can be accomplished either by computing the weighted difference in the frequencies of two peaks or by computing the ratio of the intensities of two peaks in the FFT spectrum.

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confidence: 99%

Biosensing Using Porous Silicon Double-Layer Interferometers: Reflective Interferometric Fourier Transform Spectroscopy

et al. 2005

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“…The thickness of each "layer" is determined by the etching time. A periodical switching between two distinct current densities will produce porosity multilayers with a varied refractive index profile [24]. These multilayers are able to exhibit a photonic band gap, preventing light propagation at a range of frequencies due [31,32].…”

Section: Optical Properties Of Porous Siliconmentioning

confidence: 99%

Optical Biosensing and Bioimaging With Porous Silicon and Silicon Quantum Dots (Invited Review)

Guan¹

2017

PIER

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“…Therefore, the optical properties can periodically vary with depth in the porous superlattice layer. Such structures have been applied for waveguides, microcavity and distributed Bragg reflectors [14,15]. It has been also demonstrated that these devices can be used as sensors for various type of chemical species and DNA [15,18 -20] since a filling of the pores with dielectric substances modifies the average refractive index of each layer and thus can change the optical response of the superlattice.…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization of porous InP superlattices

Tsuchiya

Hueppe

Djenizian

et al. 2004

Science and Technology of Advanced Materials

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Porous superlattices n-type (100) InP are produced electrochemically on by changing the applied current or potential periodically in 1 M HCl þ 1 M HNO 3 solutions. The superlattice consists of stack of alternating two layers with various morphologies and porosities. The planview morphologies of the top surface of superlattice were almost same, and the pore size was varied in the nano-order range. On the other hand, the cross-sectional morphologies depend strongly on the electrochemical condition. For low applied currents or potentials such as 10 mA or 1.5 V Ag/AgCl , respectively, porous layers with a facet-like structure were formed. The size of each facet did not change with the etching time, but the number of the facets increased with time. For high currents or potentials such as 50, 100 mA or 3 V Ag/AgCl , respectively, a tree-like structure with random and/or tangled branches was observed. At a still higher potential of 5 V Ag/AgCl , the porous layer exhibited fairly regular array of straight pores. Therefore, it is found that the morphology of the porous layer can be highly controlled by the applied current or potential. q

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Optical properties of porous silicon superlattices

Cited by 218 publications

References 8 publications

Biosensing Using Porous Silicon Double-Layer Interferometers: Reflective Interferometric Fourier Transform Spectroscopy

Biosensing Using Porous Silicon Double-Layer Interferometers: Reflective Interferometric Fourier Transform Spectroscopy

Optical Biosensing and Bioimaging With Porous Silicon and Silicon Quantum Dots (Invited Review)

Morphological characterization of porous InP superlattices

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