Second harmonic generation and atomic-force microscopy studies of porous silicon

Aktsipetrov, O.A.; Melnikov, A. V.; Moiseev, Yu. N.; Murzina, T. V.; Hasselt, C.W. van; Rasing, T.H.M.; Rikken, G. L. J. A.

doi:10.1063/1.115003

Cited by 8 publications

(2 citation statements)

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“…12 TappingMode was used in this study since the surfaces of the porous layers were too fragile to be imaged in contact mode SFM. 13 The SFM images of samples obtained by etching silicon at different current densities are shown in Figure 1. Using relatively low current densities (150 mA/cm 2 ), pores are scarcely visible and the nearly flat surface is dominated by a distinct hillock structure (Figure 1A).…”

Section: Resultsmentioning

confidence: 99%

Macroporous p-Type Silicon Fabry−Perot Layers. Fabrication, Characterization, and Applications in Biosensing

et al. 1998

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We present in this paper that porous silicon can be used as a large surface area matrix as well as the transducer of biomolecular interactions. We report the fabrication of heavily doped p-type porous silicon with pore diameters that can be tuned, depending on the etching condition, from approximately 5 to 1200 nm. The structure and porosity of the matrixes were characterized by scanning force microscopy (SFM) and scanning electron microscopy (SEM), Brunnauer-Emmett-Teller nitrogen adsorption isotherms, and reflectance interference spectroscopy. The thin porous silicon layers are transparent to the visible region of the reflectance spectra due to their high porosity (80-90%) and are smooth enough to produce Fabry-Perot fringe patterns upon white light illumination. Porous silicon matrixes were modified by ozone oxidation, functionalized in the presence of (2-pyridyldithiopropionamidobutyl)dimethylmethoxysilane, reduced to unmask the sulfhydryl functionalities, and coupled to biotin through a disulfide-bond-forming reaction. Such functionalized matrixes display considerable stability against oxidation and corrosion in aqueous media and were used to evaluate the utility of porous silicon in biosensing. The streptavidin-biotin interactions on the surface of porous silicon could be monitored by the changes in the effective optical thickness calculated from the observed shifts in the Fabry-Perot fringe pattern caused by the change in the refractive index of the medium upon protein-ligand binding. Porous silicon thus combines the properties of a mechanically and chemically stable high surface area matrix with the function of an optical transducer and as such may find utility in the fabrication of biosensor devices.

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Section: Resultsmentioning

confidence: 99%

Macroporous p-Type Silicon Fabry−Perot Layers. Fabrication, Characterization, and Applications in Biosensing

et al. 1998

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“…Intensive work has been carried out in this field. [1][2][3][4] Fewer papers deal with the use of SHG as a probe of thin film structure. 5,6 In this paper, we have used SHG to study the microstructure of aluminum nitride ͑AlN͒ thin films.…”

Section: Introductionmentioning

confidence: 99%

All-optical probing of material structure by second-harmonic generation: application to piezoelectric aluminum nitride thin films

1997

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Second-harmonic generation can be used to probe the microstructure of materials. This nondestructive all-optical method is applied to quantify the orientation of the aluminum nitride microcolumns. Theoretical results show that very small tilt angles of the columns are easily detectable. The sensitivity of this technique is confirmed by experimental results, which are compared with piezoelectric measurements. © 1997 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(97)

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Measurement of intensity of the second optical harmonic in heteroepitaxial cadmium-mercury telluride structures

et al. 2010

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Second harmonic generation and atomic-force microscopy studies of porous silicon

Cited by 8 publications

References 1 publication

Macroporous p-Type Silicon Fabry−Perot Layers. Fabrication, Characterization, and Applications in Biosensing

Macroporous p-Type Silicon Fabry−Perot Layers. Fabrication, Characterization, and Applications in Biosensing

All-optical probing of material structure by second-harmonic generation: application to piezoelectric aluminum nitride thin films

Measurement of intensity of the second optical harmonic in heteroepitaxial cadmium-mercury telluride structures

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