Abstract
Angle-resolved light scattering techniques are powerful tools to obtain structural and spectroscopic information on the investigated sample by means of the study of the pattern of the angular distribution of scattered light. In this paper, we show the details of a new electronic system conceived to automate a Raman coherent backscattering setup, in which it is crucial to acquire several spectra at different angles in a wide spectral acquisition range. In this frame, we used this electrical circuit to trigger the signal edges between the charged-coupled device and the motorized nanorotator stage in our setup, carrying out a considerable quantity of measurements only with an initial input given by the operator and minimizing the supervision of the experiment and, therefore, the time invested by the user in it. By means of this system that can be easily integrated in the setup, we can perform distinct type of measurements by using different configurations of the components that make up the experimental setup.
Highlights
In the case of Raman coherent backscattering (CBS) (RCBS), the very low Raman cross section makes the signal difficult to detect without a long integration time being set; the experiments require a spectral analysis of the collected light, which passes through a spectrometer before arriving to the ChargeCoupled Device (CCD)
We show an extremely precise and controlled way to automate the measurements in a RCBS experiment by using integrated circuits (ICs) and triggering the single signal edges of two important components of the RCBS experimental setup, i.e., the CCD and the motorized rotator stage
The large number of acquisitions that must be carried out in a typical RCBS experiment demands creating a system that allows us to automate the measurements, resulting in a high time saving by the user who does not need to continuously supervise the experiment
Summary
Angle-resolved light scattering (ALS) allows the characterization of a sample by giving information about the angular distribution of scattered light and identifying important properties of the studied objects, including size, shape, and refractive index. This technique is rapid, non-invasive, and easy to implement by using goniometer-based instruments where either the sample or the detector is mounted on a rotating arm. In the last few decades, different types of ALS studies have been performed to improve the experimental setups and to investigate the properties of different systems of interest in a wide range of applications, ranging from medicine to photovoltaics. Among the angle-resolved techniques, experiments of coherent backscattering (CBS) of light emerge as a valid procedure to obtain information about the structure factor in a random medium and its scattering strength as well as the light path length-distribution within the medium. CBS of light is, a robust interference effect always occurring in random media in which the coherent superposition of counter-propagating multiply scattered light waves leads to an enhanced light intensity at small angles near the backward direction. In the last few decades, CBS has been investigated in several systems, and a considerable effort has been focused on the experimental setup improvements. Recently, an experimental observation of a constructive interference effect in the inelastically backscattered Raman radiation was proposed. In the case of Raman CBS (RCBS), the very low Raman cross section makes the signal difficult to detect without a long integration time being set; the experiments require a spectral analysis of the collected light, which passes through a spectrometer before arriving to the ChargeCoupled Device (CCD). Angle-resolved light scattering (ALS) allows the characterization of a sample by giving information about the angular distribution of scattered light and identifying important properties of the studied objects, including size, shape, and refractive index.. Angle-resolved light scattering (ALS) allows the characterization of a sample by giving information about the angular distribution of scattered light and identifying important properties of the studied objects, including size, shape, and refractive index.1 This technique is rapid, non-invasive, and easy to implement by using goniometer-based instruments where either the sample or the detector is mounted on a rotating arm.. We show an extremely precise and controlled way to automate the measurements in a RCBS experiment by using integrated circuits (ICs) and triggering the single signal edges of two important components of the RCBS experimental setup, i.e., the CCD and the motorized rotator stage.
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