Speaker
Description
The detection of ultraviolet (UV) photons is becoming increasingly important in high energy particle physics experiments. Sensitivity to UV photons (wavelength range < 350 nm) is essential for detecting Cherenkov radiation in crystals as well as scintillation light in dark matter and neutrino experiments. Nowadays, scientists are looking for new materials for detectors that can directly detect UV photons and/or absorb them by emitting light in the visible spectrum, which can be measured using existing photon detectors without the need for an active cooling system. The materials must be thin to maintain calorimeter homogeneity, possess a significant surface area, and be impermeable to visible light to prevent the detection of scintillation light.
Silicon nanoparticles (SiNPs) are sensitive to UV light. Depending on the nanoparticle size, they absorb UV light and re-emit it at visible (>400 nm) wavelengths. The size of SiNPs can vary depending on the technological parameters of laser ablation. Therefore, it is essential to effectively control the laser ablation process in order to obtain nanoparticles of desired sizes.
We propose in this work to form colloidal solutions of SiNPs with varying sizes through silicon target laser ablation. These nanoparticles are then utilized as filters in charge-coupled device-based spectrometer configuration to enhance its sensitivity to the wavelengths <400 nm.
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