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1Resonant phenomena in luminescence response of low-dimensional silicon photonic structures
M. Stepikhova'*. A. Peretokin1, S. Dyakov2, M. Petrov3, V. Verbus1, Zh. Smagina4, V. Zinoviev4, D. Yurasov1, D. Shengurov1, E. Rodyakina4, A. Novikov1
1-Institute for Physics of Microstructures Russian Academy of Sciences, Nizhny Novgorod, 603950, Russia 2- Skolkovo Institute of Science and Technology, Moscow, 143025, Russia 3- Department of Physics and Engineering, ITMO University, St. Petersburg, 197101, Russia 4- Rzhanov Institute of Semiconductor Physics, Siberian Branch of Russian Academy of Sciences, Novosibirsk,
630090, Russia
The development of modern technologies opens up new possibilities for creating photonic structures with sizes comparable to and less than the wavelength of radiation, identifying new optical phenomena and possibilities for controlling the radiating properties of the active medium. In this paper, we will consider the possibilities of controlling the radiating properties of the active medium due to the effects of its interaction with resonant modes of low-dimensional photonic structures, in particular: two-dimensional photonic crystals (PhC), low-dimensional disk resonators and their arrays. Silicon structures with Ge(Si) nanoislands were used as the active medium. These structures seem promising for creating radiation sources integrated into silicon nanophotonics circuits. The paper discusses such peculiar phenomena as bound states in the continuum (BIC) characterized by the appearance of high-Q, resonant lines in the photoluminescence (PL) spectra. Symmetry protected and accidental BICs have been found in 2D photonic crystals with a hexagonal lattice of holes [1,2]. The features of the manifestations of these modes are the presence of a discontinuity in the band diagram of the photonic crystals emissivity and the characteristic vortex polarization. The vortex behavior of luminescence polarization related with BICs will be shown for the first time. The possibilities for realignment, selection and control of the dispersion characteristics of BIC modes in 2D photonic crystals by changing their parameters will also be discussed [3,4]. Another possibility of observing BICs is related with low-dimensional disk resonators. In this case, quasi-BICs were observed in the micro-PL spectra of disk resonators, which are the result of destructive interference of Mie and Fabry-Perot modes. The observed quasi-BICs are characterized by a specific radiation pattern oriented along the disk axis. Additionally, using the example of structures with arrays of low-dimensional disk resonators, the manifestations of collective phenomena, such as collective Mie modes, interaction phenomena of plasmonic and photonic modes in square lattices of metallic disks, and others will be considered [5,6]. In all cases, the observed resonant phenomena allow us to significantly modify the radiating properties of the active medium, increasing its radiative efficiency up to two orders of magnitude.
The work was supported by the Center of Excellence "Center of Photonics", funded by the Ministry of Science and Higher Education of the Russian Federation, Contract No. 075-15- 2022-316.
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