Ultrafocused Electromagnetic Field Pulses with a Hollow Cylindrical Waveguide.
Phys Rev Lett
; 119(4): 043904, 2017 Jul 28.
Article
em En
| MEDLINE
| ID: mdl-29341731
We theoretically show that a dipole externally driven by a pulse with a lower-bounded temporal width, and placed inside a cylindrical hollow waveguide, can generate a train of arbitrarily short and focused electromagnetic pulses. The waveguide encloses vacuum with perfect electric conducting walls. A dipole driven by a single short pulse, which is properly engineered to exploit the linear spectral filtering of the cylindrical hollow waveguide, excites longitudinal waveguide modes that are coherently refocused at some particular instances of time, thereby producing arbitrarily short and focused electromagnetic pulses. We numerically show that such ultrafocused pulses persist outside the cylindrical waveguide at distances comparable to its radius.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2017
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Article
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Áustria