CARS and spontaneous Raman spectroscopy in planar waveguides

Cees Otto; Johannes Sake Kanger; L. Riemersma; Jan Greve

doi:10.1117/12.197437

2 January 1995 CARS and spontaneous Raman spectroscopy in planar waveguides

Cees Otto, Johannes Sake Kanger, L. Riemersma, Jan Greve

Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197437
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus

Abstract

Raman spectroscopic techniques are developed to study the presence, structure and dynamics of (bio-)organic molecules at surfaces. Coherent anti-Stokes Raman scattering (CARS) and spontaneous Raman scattering (spRS) are used in combination with the technology to fabricate optical waveguides. A mode-locked Nd-YLF laser system with approximately 8 ps. pulse lengths was used as well as a Q-switched nanosecond pulselength Nd-YAG laser. In principle the spRS technique is more simple, however the CARS technique allows background suppression by asymmetric mode selection. Improvement of the ratio of signal of the monolayer to that of the waveguide can hence be expected. A theory was developed that describes the radiative field of a dipole in a waveguide. This theory describes the angular distribution of the radiated power from a dipole positioned at a chosen position in the waveguide configuration. It is calculated that the power varies strongly as a function of direction of observation. In particular in the direction where coupling into substrate modes occurs this is predicted to be the case. The intensity of the Raman scattering in well defined directions can be an order of magnitude larger than in the average direction.

Citation Download Citation

Cees Otto, Johannes Sake Kanger, L. Riemersma, and Jan Greve "CARS and spontaneous Raman spectroscopy in planar waveguides", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); https://doi.org/10.1117/12.197437

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