Nonlinear optical absorption properties of InP nanowires and applications as a saturable absorber  

作　　者：JUNTING LIU HONGKUN NIE BINGZHENG YAN KEJIAN YANG HE YANG VLADISLAV KHAYRUDINOV HARRI LIPSANEN BAITAO ZHANG JINGLIANG HE 

机构地区：[1]State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [2]Key Laboratory of L aser&Infrared System,Ministry of Education,Shandong University,Qingdao 266237,China [3]Department of Electronics and Nanoengineering,Aalto University,Espoo FI-00076,Finland

出　　处：《Photonics Research》2020年第6期1035-1041,共7页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61575110,61675116,61975095);Department of Science and Technology of Shandong Province(2017WLJH48);Shandong University(2020QNQT);Academy of Finland Photonics Flagship PREIN(320167);Walter AhLströmin Säätiö;Nokia.

摘　　要：Indium phosphide(InP)nanowires(NWs)have attracted significant attention due to their exotic properties that are different from the bulk counterparts,and have been widely used for light generation,amplification,detection,modulation,and switching,etc.Here,high-quality InP NWs were directly grown on a quartz substrate by the Au-nanoparticle assisted vapor-liquid-solid method.We thoroughly studied their nonlinear optical absorption properties at 1.06μm by the open-aperture Z-scan method.Interestingly,a transition phenomenon from satu-rable absorption(SA)to reverse saturable absorption(RSA)was observed with the increase of the incident laser intensity.In the analysis,we found that the effective nonlinear absorption cofficient(βeff-10^2 cm/MW)under the SA process was 3 orders of magnitude larger than that during the RSA processes.Furthermore,the SA proper-ties of InP NWs were experimentally verified by using them as a saturable absorber for a passively Q-switched Nd:YVO4 solid-state laser at 1.06μm,where the shortest pulse width of 462 ns and largest single pulse energy of 1.32μJ were obtained.Moreover,the ultrafast carrier relaxation dynamics were basically studied,and the intraband and inter-band ultrafast carrier relaxation times of 8.1 and 63.8 ps,respectively,were measured by a degenerate pump-probe method with the probe laser of 800 nm.These results well demonstrate the nonlinear optical absorption properties,which show the excellent light manipulating capabilities of InP NWs and pave a way for their applications in ultrafast nanophotonic devices.

关 键 词：OPTICAL saturable SWITCHED 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O437[机械工程—光学工程]