Measurement of weak optical signals in powders of inorganic and organic substances using photon traps

An original method for recording Raman spectra (RS) of inorganic and organic powders has been developed, based on the use of fibre-optic techniques and photon traps. The RS of zinc oxide micropowders and the aromatic substance C24H16N2O2 (РОРОР) have been investigated. It has been established that when using the developed photon traps and fibre-optic technology in the studied substances at room temperature, the Raman opalescence mode can be realised, consisting of an anomalous increase in the intensity of Raman scattering. It was found that the intensity of Raman scattering lines in the secondary radiation spectra of the studied compounds under the recording conditions used was comparable to the intensity of the excitation line. The proposed spectral analysis method based on the developed photon traps can be used to record weak secondary radiation signals from dielectric and semiconductor structures.

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