Ultralow-power all-optical tunable dual Fano resonances in nonlinear metamaterials

作者：Zhang Fan; Hu Xiaoyong^*; Zhu Yu; Yang Hong; Gong Qihuang

来源：Applied Physics Letters, 2013, 103(19): 191116.

DOI：10.1063/1.4829655

Dual Fano resonances are realized in a nonlinear photonic metamaterial consisting of periodic arrays of asymmetrical meta-molecules etched in a gold film coated with azobenzene polymer layer made of poly[(methyl methacrylate)-co-(disperse red 13 acrylate)]. Enormously enhanced photoisomerization associated with resonant excitation brings about a large refractive index variation in the azobenzene polymer. Under excitation of a weak pump light as low as 0.61 kW/cm(2), a large shift of 50 nm in the Fano resonance wavelength is obtained. Compared with previous reports, the threshold pump intensity is reduced by seven orders of magnitude while a large tunability is maintained simultaneously.

• 出版日期2013-11-4
• 单位北京大学