We intend to investigate the effect of a periodically space-modulates dispersion pattern on the propagation of an incident light pulse. The principles of such an effect can be illustrated by employing EIT (Electromagnetically Induced Transparancy) materials driven in a standing-wave (SW) pump configuration [1,2]. We will examine special classes of intrinsic semiconductors (Cu2O, CuCI) and doped crustals (Pr:YSO) exhibiting a large EIT effect [3, 5]. This is expected to lead to non-traditional photonic band-gap structures the nature of which will be thoroughly investigated. A similar investigation will be carried out for ultracold samples of alkali atoms whose band-gap will display an even richer structure . Periodically space-modulates absorption and dispersion patterns can be easily varied with time which would allow to realize a tunable photonic band-gap. EIT media are known to exhibit giant Kerr nonlinearites . We intend to exploit this feature to propose the realization of all-optical polarization qubit logic gates [8-10]
|Effective start/end date||1/01/04 → 31/12/05|
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