Nonlinear optical response of semiconductor-nanocrystals-embedded photonic band gap structure

作者：Liao Chen; Zhang Huichao; Tang Luping; Zhou Zhiqiang; Lv Changgui; Cui Yiping; Zhang Jiayu^*

来源：Applied Physics Letters, 2014, 104(17): 171901.

DOI：10.1063/1.4874613

Colloidal CdSe/ZnS core/shell nanocrystals (NCs), which were dispersed in SiO2 sol, were utilized to fabricate a SiO2: NCs/TiO2 all-dielectric photonic band gap (PBG) structure. The third-order nonlinear refractive index (n(2)) of the PBG structure was nearly triple of that of the SiO2: NCs film due to the local field enhancement in the PBG structure. The photoinduced change in refractive index (Delta n) could shift the PBG band edge, so the PBG structure would show significant transmission modification, whose transmission change was similar to 17 folds of that of the SiO2: NCs film. Under excitation of a 30GW/cm(2) femtosecond laser beam, a transmission decrease of 80% was realized.

• 出版日期2014-4-28
• 单位东南大学