Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO26)
Publication date: 22nd April 2026
Single and few-photon sources play a crucial role in various quantum applications, including quantum communication, quantum imaging, and are of great importance in quantum correlations. Semiconductor nanorods (NRs) offer a linearly polarized light emission, indicating the existence of dipole moments along with the long axis of NRs.
In this work, we wish to explore the emission anisotropy of CsPbBr3 NRs (aspect ratio~7.4) having photoluminescence quantum yields of ~84% using a newly developed approach that combines defocused imaging with heralded spectroscopy of single NRs. For this, we have used an innovative single photon avalanche diode (SPAD) array onto which the out-of-focus dipole emission pattern can be imaged, and resolved in time and space, allowing the direct observation and quantification of the difference between the emission transition dipole of the exciton (X) and biexciton states (BX) revealing multi-excitonic interactions in single perovskite NRs.1 Notably, g2(0) (~0.88 ±0.03), and lifetime for BX and X state (BX≈ 2.74 ± 0.23 ns; EX≈11.31 ± 1.11 ns) for single CPB NR shows that BX is very weakly bound, which is more in line with the observed similarity of X and BX anisotropy.
Following this advancement in quantum materials and techniques, we extend our study to quantum sensing considering nanodiamonds (NDs).2 Due to excellent biocompatibility, room temperature stable emission, nearly infinite photostability, nitrogen vacancy (NV-) centre in NDs has emerged as quantum sensor exploiting their magneto-optical response. Such approach provides scalable pathways toward quantum photonic devices and nanoscale quantum sensors for monitoring chemical and biological processes.
References:
(1) Amgar, D.; Lubin, G.; Yang, G.; Rabouw, F. T.; Oron, D., Nano Lett. 2023, 23 (12), 5417–5423.
(2) Barton, J.; Gulka, M.; Tarabek, J.; Mindarava, Y.; Wang, Z.; Schimer, J.; Raabova, H.; Bednar, J.; Plenio, M. B.; Jelezko, F.; Nesladek, M.; Cigler, P., ACS Nano 2020, 14 (10), 12938–12950.
DR thanks Daniel and Dan for their continuous support and Weizmann Institute of Science to provide all the support for reserach.
DR thanks National Quantum Mission and Prof. Tanmoy Basu and the members of CQuERE department.
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