title: Aspect ratio-related three-photon absorption and mechanism of α-FeOOH nanorods in the near-infrared.
abstract: Tuning a semiconductor nanomaterial with large three-photon absorption (3PA) cross section in the near infrared and investigating the relationship between the nanostructure and nonlinear optical properties is a challenging topic, which is of significance in potential applications. Here, we report the aspect ratio-related 3PA response of α-FeOOH nanorods (NRs) in the near infrared. Large 3PA cross section at room temperature is achieved as high as ~10(-77) cm(6) s(2) photon(-2) when the distribution of photo-induced and intrinsic surface polarization charges of excitons to both ends of NRs is tuned through the aspect ratio, yielding total enhancement more than three times larger than that of NRs with 12.1 nm diameter.
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng 475004, People's Republic of China.
authors.forename: Baohua
authors.initials: B
authors.lastname: Zhu
authors.forename: Fangfang
authors.initials: F
authors.lastname: Wang
authors.forename: Chong
authors.initials: C
authors.lastname: Wang
authors.forename: Yawan
authors.initials: Y
authors.lastname: Cao
authors.forename: Lijun
authors.initials: L
authors.lastname: Guo
authors.forename: Jiayu
authors.initials: J
authors.lastname: Zhang
authors.forename: Yuzong
authors.initials: Y
authors.lastname: Gu