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Novel scanning near-field optical microscope (SNOM)/scanning confocal optical microscope based on normal force distance regulation and bent etched fiber tips (1999)

Wolf, J. F. ; Hillner, P. E. ; Bilewicz, R. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 70 (1999), S. 2751-2757

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We report on a unique combination of a novel scanning near-field optical microscope/scanning confocal optical microscope based on normal force distance regulation with bent etched fiber tips. The use of normal force detection makes all classic atomic force microscope operation modes such as contact mode and tapping mode accessible to scanning near-field optical microscopy (SNOM), thus allowing near-field optical imaging at sample distances unavailable to shear force regulated distance control. The SNOM laser light is pulsed or detected synchronously to the fiber tapping amplitude to illuminate the sample at a predetermined height above the sample. Bent etched fiber tips are used, whose fiber diameters are additionally etched down to yield resonant frequencies between 60 and 300 kHz, Q factors around 180 and spring constants in the range of 80–400 N/m. The typical roughness of the tip cone surfaces is shown to be due to etching in a meniscus. For the first time, simultaneously acquired constant gap width mode topography and constant height mode near-field optical images are presented, allowing topography induced contrast to be separated from true optical contrast such as absorption and fluorescence. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1149840

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Adsorptionsuntersuchungen an Organokieselsäurepolymeren (1992)

Schultze, D. ; Kölsch, P. ; Noack, M. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 612 (1992), S. 137-142

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ISSN: 0044-2313

Keywords: Adsorption and swelling ; isothermes ; specific surfaces ; organosilicic acid ; double four-ring silicate units ; Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Adsorption Studies on Organosilic Acid PolymersWe present four organosilic acid polymers containing double-4-ring silicate units cross-linked at different degree by different organosilicon bridges. BET surfaces were determined and adsorption isotherms of n-hexane, benzene, nitrogen and water were measured. All polymers are hydrophobic, one of them behaves microporously, the other are unporous. With organic adsorptives, swelling and adsorption occur simultaneously. Possible relations of microporosity and structure are discussed.

Notes: BET-Oberflächen und Isothermen von n-Hexan, Benzen, Wasser und Stickstoff wurden an vier Organokieselsäurepolymeren vermessen, die sich im Vernetzungsgrad der Doppelvierring-Kieselsäureeinheiten Si8O20 und in der Struktur der Brücken unterscheiden. Ein Polymere ist mikroporös, die anderen sind unporös. Alle Polymere verhalten sich hydrophob. Neben der Adsorption tritt Quellung bei der Einwirkung organischer Adsorptive auf. Die Zusammenhänge zwischen der Länge der Brücken und der Porosität werden diskutiert.

Additional Material: 7 Ill.