Новые публикации

Tuning of Fano resonances by rotation of continuum: Wave faucet

Sadreev, Almas F.; Pilipchuk, Artem S.; Lyapina, Alina A. EPL, 117 (5): Doi: 10.1209/0295-5075/117/50011 MAR 2017

We consider wave transmission in a non-axisymmetric waveguide which consists of cylindrical resonator and two semi-infinite cylindrical waveguides whose axes are shifted relative to each other by azimuthal angle Δphgr. Although rotation by Δphgr does not change the eigenfrequency spectrum of the resonator, it effectively tunes the Fano resonances and respectively gives rise to an analog of a faucet opening and closing wave flux under rotation. Moreover, under the rotation of the waveguide and variation of the length of resonator, numerous events of the Fano resonance collapse occur to argue for the bound states in the continuum. In the nearest vicinity of the bound states scattering wave function with orbital angular momentum shows phase dislocations with giant vortical acoustic flows around.

Propagating Bloch bound states with orbital angular momentum above the light line in the array of dielectric spheres

Bulgakov, Evgeny N.; Sadreev, Almas F. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 34 (6):949-952; Doi: 10.1364/JOSAA.34.000949 JUN 1 2017

We present propagating Bloch bound states in the radiation continuum with orbital angular momentum in an infinite linear periodical array of dielectric spheres. The bound states in the continuum demonstrate a giant Poynting vector spiraling around the array. They can be excited by a plane wave with incident linear polarization with a small tilt relative to the axis of the array.