Conventional and scanning near-field optical microscopy techniques are cross referenced to femtosecond nonlinear-optical measurements and finite-element numerical simulations to visualize and analyze a strong confinement of electromagnetic radiation in guided modes of a photonic-crystal fiber with only a few air holes surrounding the fiber core. A nonlinear coefficient of about 120 W-1 km-1 is achieved at the wavelength of 670 nm for a fused-silica fiber with a full hexagonal cycle of closely packed air holes around the fiber core. The removal of a single element from this array of air holes is shown to frustrate field confinement in guided modes, leading to mode leakage. © Springer-Verlag 2005.
Electromagnetic field confined and tailored with a few air holes in a photonic-crystal fiber / A. M., Apetrei; J. M., Moison; J. A., Levenson; M., Foroni; F., Poli; A., Cucinotta; S., Selleri; M., Legre; M., Wegmuller; N., Gisin; K. V., Dukelskii; A. V., Khokhlov; V. S., Shevandin; Y., Kondratev; Sibilia, Concetta; E. E., Serebryannikov; A. M., Zheltikov. - In: APPLIED PHYSICS. B, LASERS AND OPTICS. - ISSN 0946-2171. - 81:2-3(2005), pp. 409-414. [10.1007/s00340-005-1855-9]
Electromagnetic field confined and tailored with a few air holes in a photonic-crystal fiber
SIBILIA, Concetta;
2005
Abstract
Conventional and scanning near-field optical microscopy techniques are cross referenced to femtosecond nonlinear-optical measurements and finite-element numerical simulations to visualize and analyze a strong confinement of electromagnetic radiation in guided modes of a photonic-crystal fiber with only a few air holes surrounding the fiber core. A nonlinear coefficient of about 120 W-1 km-1 is achieved at the wavelength of 670 nm for a fused-silica fiber with a full hexagonal cycle of closely packed air holes around the fiber core. The removal of a single element from this array of air holes is shown to frustrate field confinement in guided modes, leading to mode leakage. © Springer-Verlag 2005.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.