Scanning near eld optical spectroscopy with light tunnelling control
نویسنده
چکیده
منابع مشابه
Near - eld Analysis of Beam Properties of
We report mode structure and beam propagation analysis of high power strained (In,Ga)As quantum well lasers using the super-resolution capabilities of near-eld scanning optical microscopy (NSOM). We are able to directly measure the optical beam waist and astigmatism by imaging the output of the laser diode at various heights above the device facet. In the near-eld we observe spatial shifts in t...
متن کاملOptical and electrical characterization at the nanoscale with a transparent probe of a scanning tunnelling microscope.
A new type of scanning probe microscope, combining features of the scanning tunnelling microscope, the scanning tunnelling luminescence microscope with a transparent probe and the aperture scanning near-field optical microscope, is described. Proof-of-concept experiments were performed under ultrahigh vacuum conditions at varying temperature on GaAs/AlAs heterostructures.
متن کاملQuantitative Comparison of Analytical solution and Finite Element Method for investigation of Near-Infrared Light Propagation in Brain Tissue Model
Introduction: Functional Near-Infrared Spectroscopy (fNIRS) is an imaging method in which light source and detector are installed on the head; consequently, re-emission of light from human skin contains information about cerebral hemodynamic alteration. The spatial probability distribution profile of photons penetrating tissue at a source spot, scattering into the tissue, and being released at ...
متن کاملCarbon nitride materials synthesized by Ion-assisted pulsed laser deposition
Synthesis of carbon nitride has been an important topic in materials science since 1993. Ion-assisted pulsed laser deposition is proven to be a good method to deposit carbon nitride thin films. Both amorphous and crystal -C3N4 layers can be deposited on many substrates. A standard experimental set-up comprises a pulsed KrF excimer laser (wavelength 248 nm, duration ∼30 ns) that is used to ablat...
متن کاملScanning near-field optical microscopy with white-light illumination: nanoscale imaging and spectroscopy of resonant systems
We present the realisation of near-field spectroscopic measurements with fibre-tip-based scanning near-field microscopy. It allows simultaneous acquisition of near-field optical images in a broad spectral range (400 nm to 1000 nm), thus recovering local spectroscopic information. The technique is essential for understanding the resonant interaction of light with nanostructured objects as the fa...
متن کامل