Volume 77, Number 6, March 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 March 2007|
Magic angle detection of nonlinear Newton-Wigner times at interfaces
Laboratoire d'Electronique Quantique-Physique des Lasers, UMR CNRS 6627, Université de Rennes I 35042 Rennes Cedex, France
2 Simulations des Interactions entre Molécules, Photons et Atomes, UMR CNRS 6627, Université de Rennes I 35042 Rennes Cedex, France
Accepted: 29 January 2007
The existence of nonlinear Newton-Wigner delay-times in the femtosecond range is demonstrated using a pulsed laser beam with rotating polarization impinging on an interface together with a time-resolved differential detection at a “magic angle”. Experimentally, increasing the incident power by a factor of 10 leads to a decrease in the delay-time by more than 70% at total reflection. In contrast, below the critical incidence angle, the same power variation leads to a huge increase in the delay-time. Intrinsic nonlinear Newton-Wigner delays are also expected in quantum reflection and the magic angle method could be extended to shorter pulses, down to the attosecond domain. Possible applications are discussed.
PACS: 42.25.Gy – Edge and boundary effects; reflection and refraction / 42.25.Ja – Polarization / 42.65.-k – Nonlinear optics
© Europhysics Letters Association, 2007
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