Hibridni događaj

Program događaja

petak, 26.5.2023 10:15 - 13:00, Bellavista, Grand hotel Adriatic, Opatija 10:15 - 10:45 Pozvano predavanje  M. Clark, R. Wang, S. Bahrani (University of Bristol, Bristol, United Kingdom), M. Peranić (Ruđer Bošković Institute, Zagreb, Croatia), O. Alia (University of Bristol, Bristol, United Kingdom), M. Loncaric, Ž. Samec, A. Radman, M. Stipcevic (Ruđer Bošković Institute, Zagreb, Croatia), R. Nejabati, D. Simeonidou, J. Rarity, S. Joshi (University of Bristol, Bristol, United Kingdom) Polarisation Based Entanglement Distribution Quantum Networking  Quantum networks based on entanglement distribution have shown promise for building scalable and fully connected systems that support quantum key distribution. This work aims to go beyond simply implementing quantum key distribution and explore the potential of such networks for implementing quantum photonic interconnects. Our research demonstrates the passive polarization stability of these networks for over a week and highlights the benefits of dynamic reconfiguration to remove redundant resources. We discuss recent advancements in quantum frequency conversion and quantum memory-based networks, and argue that the development of scalable, long-distance interconnects is crucial for advancing quantum technology. Our findings have important implications for the future of quantum networking and highlight the need for entanglement based photonic interconnect networks, such that quantum technology can scale beyond monolithic systems. 10:45 - 13:00 Radovi  1. I. Stojanoska, B. Kmet, D. Kuščer (Jožef Stefan Institute, Ljubljana, Slovenia) Influence of Annealing Conditions on Microstructure and Electrical Properties of Ga-modified ZnO Thin Films by Spin Coating   2. A. Kuttner, S. Marschner, B. Steindl, K. Schneider-Hornstein, M. Hofbauer, H. Zimmermann (TU Wien, Vienna, Austria) Monolithic Receiver with Nine Single-Photon Avalanche Diodes  An optical receiver containing nine single-photon avalanche diodes (SPADs) and nine active quenching circuits is presented. This optical receiver was fabricated in a 0.35µm high-voltage CMOS technology without any process modifications. The SPADs avoid the excess noise of linear-mode avalanche diode receivers and allow for a better optical sensitivity. With 635 nm light, the 9-SPAD receiver achieves a sensitivity of -56.8 dBm for a bit error ratio of 2×10-3 at a data rate of 50 Mb/s. Compared to a 4-SPAD receiver fabricated in the same technology and introduced in 2020, the sensitivity is improved by 1.7 dB. The remaining gap to the quantum limit, which is -73.7 dBm at 50 Mb/s, is reduced to 16.9 dB. A comparison to the state-of-the-art of SPAD receivers will be included. 3. O. El Ouahabi, C. Fragner, A. Weiss (Joanneum Research, Pinkafeld, Austria), E. Leitgeb (Graz University of Technology, Graz, Austria) Occupancy Determination by Backscattered Visible Light Sensing  Demand driven control of heating or cooling, has the potential to reduce the energy consumption of buildings to a significant portion. One of the main cornerstones of such a demand driven control is the accurate determination of occupancy in the building or sub-areas of the building. In recent years many different approaches, founded on various technologies and sensing principles have been used for establishing an occupancy detection system. Especially in existing buildings retrofitting such a system can be associated with high installation effort and cost. Furthermore some technological approaches, mainly camera based systems are inflicting concerns in regard to the privacy of the users. In this manuscript we present and discuss an approach for a network of lighting fixtures that perform person recognition based on the technology of Visible Light Sensing. In our implemented system by solely capturing reflections of the visible light, caused by bypassing persons, the occupancy, the movement direction and the walking speed can be accurately determined. Based on comprehensive real world experiments we will show how our system, fully integrated into off-the shelf luminaires, is able to operate in different scenarios and ambient light conditions and only requires minimal installation effort without causing any privacy concerns. 4. S. Thekke Thalakkal, D. Ristic, D. Zhivotkov (Ruder Boskovic Institute, Zagreb, Croatia), G. Nunzi Conti (MiPLab, IFAC-CNR, Sesto Fiorentino, Italy), M. Ivanda (Ruder Boskovic Institute, Zagreb, Croatia) An Experimental Investigation of Whispering Gallery Mode Microsphere Resonators for Sensing, Lasing, and Nonlinear Optical Applications  Microsphere resonators are gaining popularity as a key component in photonic circuit devices, optical communications, sensing, lasing, and nonlinear optical applications. As one of the essential categories of optical microcavities, microsphere resonators based on whispering gallery modes (WGMs) have benefits of ultra-high Q factor, small mode volume, ease of fabrication, and low cost. In this paper, we will present experimental results achieved by our group in regards to different application of microsphere resonators: 1) We studied the refractometric gas sensing sensitivity and the effect of thickness of the sol-gel silica layer coated to the microsphere to detect small traces of ammonia. 2) Rare earth doped microsphere resonators are promising candidates for lasing applications. Tellurite, fluoride, phosphate, and silicate glasses are good hosts for doping with rare earth elements for broadband applications. Tellurite doping with various rare earth elements can provide a wide stimulated emission cross section in the communication band. 3) High Q factor and low mode volume of WGM microresonators is a perfect host for non-linear optics application. We will present some non-linear effects which are present in silica spherical microresonators which include stimulated Raman scattering and frequency comb generation via degenerative four wave mixing.

Osnovni podaci:

Vera Gradišnik (Croatia), Irena Jurdana (Croatia), Marin Karuza (Croatia), Duško Čakara (Croatia), Mario Stipčević (Croatia)

Domenico Caputo (Italy), Andreja Gajović (Croatia)

Prijava/Kotizacija:

Popust se ne odnosi na studente doktorskog studija.

Vera Gradišnik

Sveučilište u Rijeci
Tehnički fakultet
Vukovarska 58
51000 Rijeka, Hrvatska

e-mail: Vera.Gradisnik@riteh.uniri.hr ili Vera.Gradisnik@rijeka.riteh.hr
Tel. +385 51 651 557

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