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Ultrafast carrier dynamics and nonlinear optical response of InAsP nanowires

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Photonics Research 2021年第9期9卷 1811-1819页

作者： JUNTING LIU HE YANG vladislav khayrudinov HARRI LIPSANEN HONGKUN NIE KEJIAN YANG BAITAO ZHANG JINGLIANG HE State Key Laboratory of Crystal Materials Institute of Novel SemiconductorsShandong UniversityJinan 250100China Summa Semiconductor Oy MicronovaEspoo FI-00076Finland Department of Electronics and Nanoengineering Aalto UniversityEspoo FI-00076Finland

Indium arsenide phosphide(In As P)nanowires(NWs),a member of theⅢ–Ⅴsemiconductor family,have been used in various photonic and optoelectronic applications thanks to their unique electrical and optical properties such as high carrier mobility and adjustable band *** this work,we synthesize In As P NWs and further explore their nonlinear optical *** ultrafast carrier dynamics and nonlinear optical response are thoroughly studied based on the nondegenerate pump probe and Z-scan experimental *** different characteristic carrier lifetimes(~2 and~15 ps)from In As P NWs are observed during the excited-carrier relaxation *** on the physical model analysis,the relaxation process can be ascribed to the carrier cooling process via carrier-phonon scattering and Auger *** addition,based on the measured excited-carrier lifetime and Pauli-blocking principle,we discover that In As P NWs show strong saturable absorption properties at the wavelengths of 532 and 1064 ***,we demonstrate for the first time a femtosecond(~426 fs)solid-state laser based on an In As P NWs saturable absorber at 1.04μ*** believe that our work provides a better understanding of the In As P NWs optical properties and will further advance their photonic applications in the near-infrared range.

关键词： nanowires nonlinear relaxation

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

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Photonics Research 2020年第6期8卷 1035-1041页

作者： JUNTING LIU HONGKUN NIE BINGZHENG YAN KEJIAN YANG HE YANG vladislav khayrudinov HARRI LIPSANEN BAITAO ZHANG JINGLIANG HE State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China Key Laboratory of L aser&Infrared System Ministry of EducationShandong UniversityQingdao 266237China Department of Electronics and Nanoengineering Aalto UniversityEspoo FI-00076Finland

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,***,high-quality InP NWs were directly grown on a quartz substrate by the Au-nanoparticle assisted vapor-liquid-solid *** thoroughly studied their nonlinear optical absorption properties at 1.06μm by the open-aperture Z-scan ***,a transition phenomenon from satu-rable absorption(SA)to reverse saturable absorption(RSA)was observed with the increase of the incident laser *** 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 ***,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 ***,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 *** 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

Nanowire-assisted microcavity in a photonic crystal waveguide and the enabled high-efficiency optical frequency conversions

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Photonics Research 2020年第11期8卷 1734-1741页

作者： Linpeng Gu Liang Fang Qingchen Yuan Xuetao Gan Hao Yang Xutao Zhang Juntao Li Hanlin Fang vladislav khayrudinov Harri Lipsanen Zhipei Sun Jianlin Zhao Key Laboratory of Space Applied Physics and Chemistry Ministry of Educationand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi'an 710129China State Key Laboratory of Optoelectronic Materials&Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Department of Electronics and Nanoengineering Aalto UniversityEspoo FI-00076Finland QTF Centre of Excellence Department of Applied PhysicsAalto UniversityEspoo FI-00076Finland

We report an indium phosphide nanowire(NW)-induced cavity in a silicon planar photonic crystal(PPC)waveguide to improve the light–NW *** integration of NW shifts the transmission band of the PPC waveguide into the mode gap of the bare waveguide,which gives rise to a microcavity located on the NW *** modes with𝑄factors exceeding 103 are *** on the high density of the electric field in the microcavity,the light–NW interaction is enhanced strongly for efficient nonlinear frequency ***-harmonic generation and sum-frequency generation in the NW are realized with a continuous-wave pump laser in a power level of tens of microwatts,showing a cavity-enhancement factor of *** hybrid integration structure of NW-PPC waveguide and the self-formed microcavity not only opens a simple strategy to effectively enhance light–NW interactions,but also provides a compact platform to construct NW-based on-chip active devices.

关键词： waveguide pump crystal

Mode couplings of a semiconductor nanowire scanning across a photonic crystal nanocavity

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Chinese Optics Letters 2019年第6期17卷 80-85页

作者： Qingchen Yuan Liang Fang Qiang Zhao Yadong Wang Bo Mao Zhipei Sun Jianlin Zhao Xuetao Gan MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical UniversityXi’an 710072China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China Department of Electronics and Nanoengineering Aalto UniversityEspooFI-00076Finland QTF Centre of Excellence Department of Applied PhysicsAalto UniversityEspooFI-00076Finland

The position-dependent mode couplings between a semiconductor nanowire(NW)and a planar photonic crystal(PPC)nanocavity are *** scanning an NW across a PPC nanocavity along the hexagonal lattice’sΓ– M and M– K directions,the variations of resonant wavelengths,quality factors,and mode volumes in both fundamental and second-order resonant modes are calculated,implying optimal configurations for strong mode-NW couplings and light-NW *** the fundamental(second-order)resonant mode,scanning an NW along the M– K(Γ– M)direction is preferred,which supports stronger light-NW interactions with larger NW-position tolerances and higher quality factors *** simulation results are confirmed experimentally with good agreements.

关键词： The position-dependent semiconductor nanowire(NW) with good agreements