Abstract
Raman and photoluminescence (PL) spectroscopy are important analytic tools in materials science that yield information on molecules’ and crystals’ vibrational and electronic properties. Here, we show results of a novel approach for Raman and PL spectroscopy to exploit variable spectral resolution by using zoom optics in a monochromator in the front of the detector. Our results show that the spectral intervals of interest can be recorded with different zoom factors, significantly reducing the acquisition time and changing the spectral resolution for different zoom factors. The smallest spectral intervals recorded at the maximum zoom factor yield higher spectral resolution suitable for Raman spectra. In contrast, larger spectral intervals recorded at the minimum zoom factor yield the lowest spectral resolution suitable for luminescence spectra. We have demonstrated the change in spectral resolution by zoom objective with a zoom factor of 6, but the perspective of such an approach is up to a zoom factor of 20. We have compared such an approach on the prototype Raman spectrometer with the high quality commercial one. The comparison was made on ZrO2 and TiO2 nanocrystals for Raman scattering and Al2O3 for PL emission recording. Beside demonstrating that Raman spectrometer can be used for PL and Raman spectroscopy without changing of grating, our results show that such a spectrometer could be an efficient and fast tool in searching for Raman and PL bands of unknown materials and, thereafter, spectral recording of the spectral interval of interest at an appropriate spectral resolution.
Highlights
In various scientific fields of research, it is necessary to analyze materials’ structural and electronic properties
This paper presents a novel concept for developing a Raman spectrometer with a variable spectral resolution by implementing zoom optics into the monochromator of the spectrometer
A novel approach for Raman and PL spectroscopy based on a variable spectral resolution is described
Summary
In various scientific fields of research, it is necessary to analyze materials’ structural and electronic properties. If the PL signal is stronger and spectrally broader because of larger cross section of the fluorescence process, the recording process consists of a lot of spectral intervals (defined by the physical size of the CCD) combined into the single superimposed PL and Raman spectrum. Have been made to build cost-effective laboratory-based and portable Raman spectrometers of low spectral resolution Their main purpose is to record Raman spectra for fast inspection of materials. The large spectral intervals are obtained with the smallest zoom factor (ZF) of the inserted optics This is suitable for recording PL spectra, and the fast inspection of the whole Raman spectrum since the same amount of photons is distributed over a smaller number of pixels on the CCD. Contrary to the usual solutions, the degree of spectral resolution in the proposed spectrometer can be varied by the ZF of the focusing zoom lens to the detector [39,40]
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