title: Wavelength-converted/selective waveguiding based on composition-graded semiconductor nanowires.
abstract: Compact wavelength-sensitive optical components are desirable for optical information processing and communication in photonic integrated system. In this work, optical waveguiding along single composition-graded CdS(x)Se(1-x) nanowires were systematically investigated. Under a focused laser excitation, the excited light can be guided passively along the bandgap-increased direction of the nanowire, keeping the photonic energy of the guided light almost unchanged during the whole propagation. In comparison, the excited light is guided actively through incessantly repeated band-to-band reabsorption and re-emitting processes along the bandgap-decreased direction, resulting in a gradual wavelength conversion during propagation. On the basis of this wavelength-converted waveguiding, a concept of nanoscale wavelength splitter is demonstrated by assembling a graded nanowire with several composition-uniform nanowires into branched nanowire structure. Our study indicates that composition-graded semiconductor nanowires would open new exciting opportunities in developing new wavelength-sensitive optical components for integrated nanophotonic devices.
authors.affiliation: Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Physics and Microelectronics Science, Hunan University, Changsha 410082, China.
authors.forename: Jinyou
authors.initials: J
authors.lastname: Xu
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Zhuang
authors.forename: Pengfei
authors.initials: P
authors.lastname: Guo
authors.forename: Qinglin
authors.initials: Q
authors.lastname: Zhang
authors.forename: Weiqing
authors.initials: W
authors.lastname: Huang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wan
authors.forename: Wei
authors.initials: W
authors.lastname: Hu
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Zhu
authors.forename: Changzeng
authors.initials: C
authors.lastname: Fan
authors.forename: Zongyin
authors.initials: Z
authors.lastname: Yang
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
authors.forename: Anlian
authors.initials: A
authors.lastname: Pan
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D055096:Optical Devices; D010316:Particle Size; D012031:Refractometry / Q000295:instrumentation*; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide