First Prize of the National Natural Science Award (2006)
Research Subject:
Dielectric superlattice; Nonlinear optical frequency conversion; Polariton.
Principal Investigator:
Prof. Naiben MIN
mnb@nju.edu.cn
Research Content & Progress:
We extended the concept of superlattice to dielectrics and systematically studied the propagation and excitation of electromagnetic and acoustic waves in quasiperiodic and two-dimensional dielectric su-perlattices (DSL) as well as the coupling effects. A number of new effects were theoretically predicted and experimentally demonstrated, such as the cascaded nonlinear frequency conversion, the coupling of superlattice vibration with the microwave, the generation of the new type of polaritons, the new mecha-nism for optical bistability and optical instability, the enhancement of elastic and inelastic scattering by quasi-phase-matching, the coherent construction of the acoustic excitation etc. Based on the above results, we fabricated all-solid-state lasers operating at multi-frequencies as well as quasi-white-light lasers with an output higher than 1W；we extended the long wavelength optical properties of polariton from infrared to microwave range, thus providing a new method for the design of microwave gap de-vices；we realized the enhancement of the Raman signal up to 4 to 5 orders experimentally, which is useful for designing the new type of Raman Lasers; we fabricated several prototype acoustic devices, operating at frequencies in the range from several hundred MHz to several GHz, which is impossible to realize with the ordinary bulk acoustic devices, etc. We also developed the expert system for the DSL design, three methods for the fabrication of the DSL (i.e., the growth striation method, electric field poling method and grating writing by optical hologram), two techniques to characterize the DSL non-destructively with microwave near field microscopy and environmental electron scanning microscopy.
