Biological Imaging Using Near-Field Scanning Optical Microscopy

Stebounova, Larissa V.; Paulite, Melissa; Walker, Gilbert C.; Fakhraai, Zahra

doi:10.1016/b978-0-12-374396-1.00089-1

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2013

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“…Detecting light with a spatial resolution that overcomes the diffraction limit is of interest in many areas including the design and characterization of metamaterials and plasmonic nanostructures as well as in various biophotonics applications [1][2][3]. In typical near-field scanning optical microscopy (NSOM), a sharp probe or small aperture is used to scatter the electromagnetic field close to the surface of a sample where high spatial resolution information is contained in the evanescent fields.…”

Section: Introductionmentioning

confidence: 99%

Multi-frequency near-field scanning optical microscopy

Kohlgraf-Owens¹,

Greusard²,

Sukhov³

et al. 2013

Nanotechnology

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We demonstrate a new multi-frequency approach for mapping near-field optically induced forces with subwavelength spatial resolution. The concept relies on oscillating a scanning probe at two different frequencies. Oscillations at one frequency are driven electrically to provide positional feedback regulation. Modulations at another frequency are induced optically and are used to measure the mechanical action of the optical field on the probe. Because the measurement is based on locally detecting the force of the electromagnetic radiation acting on the probe, the new method does not require a photodetector to map the radiation distribution and, therefore, can provide true broadband detection of light with a single probe.

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Section: Introductionmentioning

confidence: 99%