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Fiber-optic Bragg gratings as magnetic field-insensitive strain sensors for the surveillance of cryogenic devices

While conventional electrical resistance strain gages show increasing cross-sensitivities to temperature and magnetic field with decreasing temperature down to liquid helium, it has been found that fiber-optic...

Sensitive Measurement of Partial Coherence Using a Pinhole Array

Biochemical imaging below the diffraction limit – probing cellular membrane related structures by tip-enhanced Raman spectroscopy (TERS)

A first vibrational mapping on the nanometer scale was performed on a protein (streptavidin) labelled supported phospholipid film by means of tip-enhanced Raman spectroscopy (TERS). For this purpose a...

Electrically tunable Lyot filter for fast wavelength switching of diode-pumped solid-state disk lasers

A new setup for fast wavelength switching of an Yb:YAG disk laser uses a lithium niobate Lyot filter. It is modeled by the Jones matrix formalism and it is tested experimentally. Applying a high voltage...

Probing the structure and Franck-Condon region of protochlorophyllide a through analysis of the Raman and resonance Raman spectra

The structure and Franck–Condon region of protochlorophyllide a, a precursor in the biosynthesis of chlorophyll and substrate of the light-regulated enzyme protochlorophyllide oxidoreductase (POR), were...

Novel Bottom-Up SERS Substrates for Quantitative and Parallelized Analytics

Fiber Bragg grating based spatially resolved characterization of flux-pinning-induced strain of disk-shaped bulk YBCO samples

A new optical method for the characterization of magnetostrictive effects in bulk superconductors will be presented. Several of wavelength encoded fiber Bragg gratings can be inscribed in one fiber with...

Lithographically patterned silicon nanowire arrays for matrix free LDI-TOF/MS analysis of lipids

Silicon nanowire arrays were patterned onto silicon chips by a combination of lithography and chemical vapor deposition using the vapor-liquid-solid growth method. Thus, highly reproducible sample deposition...

A comparative Raman and CARS imaging study of colon tissue

An experimental evaluation of the information content of two complimentary techniques, linear Raman and coherent anti-Stokes Raman scattering (CARS) microscopy, is presented. CARS is a nonlinear variant...

Relationship between molecular structure and Raman spectra of quinolines

DFT calculations were applied to investigate the relationship between the molecular structure and the Raman spectra of quinolines. A variety of different quinolines with increasing complexity was investigated...