We reveal a number of fundamentally important effects which underpin the key aspects of light propagation in
photonic structures composed of coupled waveguides with loss and gain regions, which are designed as optical
analogues of complex parity-time (or PT) symmetric potentials. We identify a generic nature of time-reversals
in PT-symmetric optical couplers, which enables flexible control of all-optical switching and a realization of
logic operations. We also show that light propagation in PT-symmetric structures can exhibit strongly nonlocal
sensitivity to topology of a photonic structure. These results suggest new possibilities for shaping optical beams
and pulses compared to conservative structures.
In this report we presented results of gas sensitivity' kinetics analysis for undoped SnO2 thin films, deposited by spray pyrolysis method, using SnCl4x5H2O alcohol solution. The comparison of gas sensitivity's kinetics in measurement cycles air yields {air+(0.08 - 1.7%)CO} yields air and air yields (N2 + 0.5%O2} yields air for different thickness of SnO2 films (d equals 40 - 200 nm) and operating temperature (T equals 150 - 400 degree(s)C) was carried out. We have determined the kinetic parameters ((tau) and Eact) and made a conclusion that kinetics of gas sensitivity is limited by the rate of SnO2 surface refilling by oxygen.
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