20 02 Superluminal tunneling through two successive barriers
نویسنده
چکیده
Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, 24044–Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: [email protected] and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di Bergamo, 24044–Dalmine (BG), Italy; e-mail: [email protected]
منابع مشابه
Measurement of superluminal optical tunneling times in double-barrier photonic band gaps.
Tunneling of optical pulses at 1.5 microm wavelength through double-barrier periodic fiber Bragg gratings is experimentally investigated in this paper. Tunneling time measurements as a function of the barrier distance show that, far from resonances of the structure, the transit time is paradoxically short--implying superluminal propagation--and almost independent of the barrier distance. This r...
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Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: [email protected] and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di Bergamo, 24044–Dalmine (BG), Italy; e-mail: Giovanni.Sal...
متن کاملTunneling through Two Successive Barriers and the Hartman (superluminal) Effect
Erasmo Recami Facoltà di Ingegneria, Università statale di Bergamo, Dalmine (BG), Italy; I.N.F.N.–Sezione di Milano, Milan, Italy; and D.M.O./FEEC and C.C.S., State University at Campinas, Campinas, S.P., Brazil; e-mail: [email protected] and Giovanni Salesi I.N.F.N.–Sezione di Milano, Milan, Italy; and Facoltà di Ingegneria, Università statale di Bergamo, 24044–Dalmine (BG), Italy; e-ma...
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We show that the group delay in tunneling is not a traversal time but a lifetime of stored energy or stored probability escaping through both ends of the barrier. Because it is a lifetime associated with both forward (transmitted) and backward (reflected) fluxes, it cannot be used to define a group velocity for forward transit in cases where a wavepacket is mostly reflected. For photonic tunnel...
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Tunneling of microwaves through a smooth barrier in a transmission line is considered. In contrast to standard wave barriers, we study the case where the dielectric permittivity is positive, and the barrier is caused by the inhomogeneous dielectric profile. It is found that reflectionless, superluminal tunneling can take place for waves with a finite spectral width. The consequences of these fi...
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