
Proceedings Paper
Indirect transitions of a signal interacting with a moving refractive index frontFormat | Member Price | Non-Member Price |
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Paper Abstract
The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected
from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is
generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated
photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts
and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects
can be potentially realized with a refractive index modulation as small as 0.001.
For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index
front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow
light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right
frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering
two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the
signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect
transition and not by a direct transition without wave vector variation.
Paper Details
Date Published: 29 September 2014
PDF: 6 pages
Proc. SPIE 9162, Active Photonic Materials VI, 91621W (29 September 2014); doi: 10.1117/12.2063078
Published in SPIE Proceedings Vol. 9162:
Active Photonic Materials VI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)
PDF: 6 pages
Proc. SPIE 9162, Active Photonic Materials VI, 91621W (29 September 2014); doi: 10.1117/12.2063078
Show Author Affiliations
Michel Castellanos Muñoz, Technische Univ. Hamburg-Harburg (Germany)
Alexander Yu. Petrov, Technische Univ. Hamburg-Harburg (Germany)
Liam O’Faolain, Univ. of St. Andrews (United Kingdom)
Alexander Yu. Petrov, Technische Univ. Hamburg-Harburg (Germany)
Liam O’Faolain, Univ. of St. Andrews (United Kingdom)
Juntao Li, Sun Yat-sen Univ. (China)
Thomas F. Krauss, The Univ. of York (United Kingdom)
Manfred Eich, Technische Univ. Hamburg-Harburg (Germany)
Thomas F. Krauss, The Univ. of York (United Kingdom)
Manfred Eich, Technische Univ. Hamburg-Harburg (Germany)
Published in SPIE Proceedings Vol. 9162:
Active Photonic Materials VI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)
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