A. Krasnok, M. Caldarola, N. Bonod, and A. Alú, Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures, Adv. Opt. Mater. 6, 1701094 (2018)

Resonant dielectric nanoparticles, like Si, GaP, GaAs, offer a powerful platform for nanophotonics and quantum optics. They provide electric and magnetic resonant responses across the visible and infrared spectrum, low losses, and absence of quenching. This review showcases their multifunctionality, from enhanced spectroscopy to lab-on-a-chip technology, and highlights future research challenges.

N. Nefedkin, A. Alù, and A. Krasnok, Quantum Embedded Superstates, Adv. Quantum Technol. 4, 2000121 (2021).

We have successfully demonstrated the creation of quantum superstates with an infinitely narrow emission line in a customizable three-level quantum system. Moreover, by coupling this system with a cavity, we have achieved exceptional statistical sensing capabilities. These findings have broad implications for various quantum platforms, paving the way for exciting advancements in quantum sensing and computing.

Quantum and optical sensors

A. Krasnok, N. Nefedkin, and A. Alu, Parity-Time Symmetry and Exceptional Points [Electromagnetic Perspectives], IEEE Antennas Propag. Mag. 63, 110 (2021).

In this article, we present a tutorial introducing unusual electromagnetic phenomena in non-Hermitian systems, focusing on PT-symmetric systems. We explore PT operators' impact on electromagnetism and quantum mechanics, discussing the unique response of PT-symmetric structures, exceptional points (EPs), and their unconventional scattering behavior. We examine applications, challenges, and potential in classical and quantum domains.