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Bolometric detectors are excellent devices for the investigation ofneutrinoless double-beta decay (0$\nu\beta\beta$). The observation of suchdecay would demonstrate the violation of lepton number, and at the same time itwould necessarily imply that neutrinos have a Majorana character. Thesensitivity of cryogenic detectors based on TeO$_2$ is strongly limited by thealpha background in the region of interest for the 0$\nu\beta\beta$ of$^{130}$Te. It has been demonstrated that particle discrimination in TeO$_2$bolometers is possible measuring the Cherenkov light produced by particleinteractions. However an event-by-event discrimination with NTD-based lightdetectors has to be demonstrated. We will discuss the performance of ahighly-sensitive light detector exploiting the Neganov-Luke effect for signalamplification. The detector, being operated with NTD-thermistor and coupled toa 750 g TeO$_2$ crystal, shows the ability for an event-by-event identificationof electron/gamma and alpha particles. The extremely low detector baselinenoise, RMS 19 eV, demonstrates the possibility to enhance the sensitivity ofTeO$_2$-based 0$\nu\beta\beta$ experiment to an unprecedented level.

Background suppression in massive TeO$_2$ bolometers with Neganov-Luke amplified light detectors