Publication

Very high resolution near-field chemical imaging using an infrared free electron laser

Giorgio Margaritondo
2002
Journal Articles

Abstract

High resolution infrared imaging of thin films and biological systems is one of the most challenging experimental problems in contemporary science and technology. In this work, we have for the first time successfully tested a novel high resolution approach, based on a spectroscopic version of scanning near-field optical microscopy (SNOM). The coupling of the Vanderbilt Free Electron Laser tunable infrared radiation to SNOM apparatus enabled us to clearly reveal different chemical constituents on a growth medium for biofilm. The images were obtained by SNOM detection of reflected 6.95 mum photons, corresponding to the stretch absorption of sulfur and nitrogen compounds, constituents of the growth medium. We attained a lateral resolution of 0.2 mum (lambda/35), well below the diffraction limit of classical microscopy.

Official source

https://infoscience.epfl.ch/entities/publication/ed4fabbb-fb0f-42ac-a0aa-407c608c3cf0

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Giorgio Margaritondo
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ed4fabbb-fb0f-42ac-a0aa-407c608c3cf0

About this result

Related concepts (32)

Super-resolution microscopy

Super-resolution microscopy is a series of techniques in optical microscopy that allow such images to have resolutions higher than those imposed by the diffraction limit, which is due to the diffraction of light. Super-resolution imaging techniques rely on the near-field (photon-tunneling microscopy as well as those that use the Pendry Superlens and near field scanning optical microscopy) or on the far-field.

Near-field scanning optical microscope

Near-field scanning optical microscopy (NSOM) or scanning near-field optical microscopy (SNOM) is a microscopy technique for nanostructure investigation that breaks the far field resolution limit by exploiting the properties of evanescent waves. In SNOM, the excitation laser light is focused through an aperture with a diameter smaller than the excitation wavelength, resulting in an evanescent field (or near-field) on the far side of the aperture.

Microscopy

Microscopy is the technical field of using microscopes to view objects and areas of objects that cannot be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical, electron, and scanning probe microscopy, along with the emerging field of X-ray microscopy. Optical microscopy and electron microscopy involve the diffraction, reflection, or refraction of electromagnetic radiation/electron beams interacting with the specimen, and the collection of the scattered radiation or another signal in order to create an image.

Related publications (10)

Very high resolution near-field chemical imaging using an infrared free electron laser

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