Jukun Liu

Shanghai Institute of Technology

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Zhenrong Sun

East China Normal University

Tianqing Jia

East China Normal University

Donghai Feng

East China Normal University

Shian Zhang

Zhejiang Provincial People's Hospital

Kaiqiang Cao

Shenyang University of Chemical Technology

K. L. Cheng

Shanghai Jiao Tong University

Jiaqi Ju

Shanghai Institute of Technology

Hongxiang Dai

Shanghai Institute of Technology

Qilin Jiang

East China Normal University

Ziyao Qin

Shanghai Research Institute of Chemical Industry

Cooperative Institutions

East China Normal University

Chinese Academy of Sciences

Shanghai Institute of Technology

University of Chinese Academy of Sciences

Xi'an Shiyou University

Shanxi University

Zhejiang University

Shanxi University of Traditional Chinese Medicine

Shanghai Institute of Optics and Fine Mechanics

Shanghai Dianji University

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A triple Fano resonance Si–graphene metasurface for multi-channel tunable ultra-narrow band sensing

Physical Chemistry Chemical Physics (2024)

Jukun Liu Hongxiang Dai Jiaqi Ju K. L. Cheng

In this work, a dielectric metasurface composed of a silicon nanodisk etched with a square hole is proposed.

Fano resonance

10.1039/d3cp05550g

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Citations (1)

Laser-induced deep-subwavelength periodic nanostructures with large-scale uniformity

Applied Physics Letters (2023)

Jiao Geng Liping Shi Jukun Liu Liye Xu Wei Yan

Femtosecond lasers are capable of fabricating uniform periodic nanostructures with a near-wavelength periodicity; however, it is challenging to produce subwavelength nanostructures with large-scale uniformity. Here, we investigate femtosecond laser-induced self-assembly of periodic nanostructures on Si-on-Pt hybrid ultrathin films via photothermal-induced oxidation. The coexistence of scattering light and surface plasmon polaritons on the hybrid films gives rise to a diversity of surface morphologies. Depending on the laser power and sample scanning velocity, beyond the traditional one-dimensional nanogratings that exhibit a near-wavelength periodicity, two types of nanostructures with subdiffraction-limit periodicity while large-scale uniformity are also observed. The first type, occurring at high laser energy and low scanning velocity, is generated by the spatial frequency doubling of the traditional laser-plasmon-interfering nanogratings. It exhibits a periodicity of <λ2. The second type, deep-subwavelength nanostructures, takes place at low pulse energy or low scanning velocity. It is in the form of two-dimensional nanoparticles and has a periodicity of <λ4. The far-field laser-plasmon interference associated with near-field scattering is attributed to the formation of such deep-subwavelength nanostructures, as confirmed by finite-difference time-domain numerical simulations. Our work provides a route toward high-throughput laser fabrication of large-scale deep-subwavelength periodic nanostructures.

10.1063/5.0138290

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Citations (7)

Electromagnetic origin of femtosecond laser-induced periodic surface structures on GaP crystals

Optics Express (2022)

Min Lu K. L. Cheng Ziyao Qin Jiaqi Ju Jukun Liu

The formations of different types of laser-induced periodic surface structures (LIPSS) on the surface of GaP crystals with different laser fluence are researched in experiments. The transition from the high spatial frequency LIPSS (HSFL) to the low spatial frequency LIPSS (LSFL) occurred as the number of the irradiated laser pulse increased. The finite difference time domain method combined with the holographic ablation model is used to simulate the LIPSS formation under the irradiation of multiple pulses. Different types of ripples are predicted by the electromagnetic approach. Results demonstrate that the electromagnetic origins of HSFL and LSFL are due to the interference of incident field and the scattering field under the multi-pulse irradiation.

Spatial frequency

10.1364/oe.452577

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Two-photon excitation of surface plasmon and the period-increasing effect of low spatial frequency ripples on a GaP crystal in air/water

Journal of Physics D Applied Physics (2016)

Jukun Liu Tianqing Jia Hongwei Zhao Huang Yao-Qing

We report the period-increasing effect of low spatial frequency ripples on a GaP crystal irradiated by 1 kHz, 50 fs, 800 nm femtosecond laser pulses. Massive free electrons are excited by a two-photon absorption process and surface plasmon is excited. The Drude model is used to estimate the changing of the dielectric constant of the GaP crystal. The period-increasing effects of low spatial frequency laser-induced ripples are theoretically predicted in air/water, and the experimental results agree well. The experimental and theoretical results indicate that surface plasmon excited by two-photon absorption plays a key role in the formation of low spatial frequency ripples.

Crystal (programming language)

10.1088/0022-3727/49/43/435105

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Direct writing of 150 nm gratings and squares on ZnO crystal in water by using 800 nm femtosecond laser

Optics Express (2014)

Jukun Liu Tianqing Jia Kan Zhou Donghai Feng Shian Zhang

We present a controllable fabrication of nanogratings and nanosquares on the surface of ZnO crystal in water based on femtosecond laser-induced periodic surface structures (LIPSS). The formation of nanogrooves depends on both laser fluence and writing speed. A single groove with width less than 40 nm and double grooves with distance of 150 nm have been produced by manipulating 800 nm femtosecond laser fluence. Nanogratings with period of 150 nm, 300 nm and 1000 nm, and nanosquares with dimensions of 150 × 150 nm2 were fabricated by using this direct femtosecond laser writing technique.

Groove (engineering)

Crystal (programming language)

10.1364/oe.22.032361

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Citations (38)

Ultrafast dynamics of single-pulse femtosecond laser-induced periodic ripples on the surface of a gold film

Physical review. B./Physical review. B (2018)

K. L. Cheng Jukun Liu Kaiqiang Cao Long Chen Yuchan Zhang

The ultrafast dynamics of periodic ripples are studied during their formation on the surface of a gold film with a prefabricated nanogroove. These transient ripples are induced by a single 800-nm, 50-fs laser pulse and are observed by a collinear pump-probe imaging method. When the laser polarization is parallel to the nanogroove, transient ripples begin appearing after an elapsed time of 25--80 ps, and become clear and regular at 400--600 ps. The ripple period increases from 685 to 770 nm as the laser fluence $F$ increases from 0.73 to $3.42\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{c}{\mathrm{m}}^{2}$. The evolution of temperature and lattice temperature are theoretically studied using the two-temperature model. When the laser fluence $F$ is above $0.73\phantom{\rule{0.16em}{0ex}}\mathrm{J}/\mathrm{c}{\mathrm{m}}^{2}$, the electron temperature rises to several ${10}^{4}\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and the collision frequency rises above ${10}^{16}/\mathrm{s}$, which further causes the localization of hot electrons. Moreover, the $d$-band electrons can be excited through two-photon absorption and become free electrons. Using the dielectric constant of the excited states, which includes the effects of hot-electron localization and $d$-band transitions, the period predicted by the surface-plasmon-polarization (SPP) model accords well with experimental results. Both theory and experiment give support to SPP excitations playing a prominent role in the formation of periodic ripples induced by femtosecond laser pulses.

10.1103/physrevb.98.184106

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Citations (46)

Supplementary document for Surface birefringence of regular periodic nanoripples produced on glass coated with indium tin oxide film using a low-fluence femtosecond laser through a cylindrical lens - 4804761.pdf

Long Chen Kaiqiang Cao Jukun Liu Tianqing Jia Zhang Shi

Indium tin oxide

10.6084/m9.figshare.12923867.v1

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Surface birefringence of regular periodic surface structures produced on glass coated with an indium tin oxide film using a low-fluence femtosecond laser through a cylindrical lens

Optics Express (2020)

Long Chen Kaiqiang Cao Jukun Liu Tianqing Jia Yanli Li

Large-area regular laser-induced periodic surface structures (LIPSSs) with a birefringence effect were efficiently produced on a glass surface coated with an indium tin oxide (ITO) film, through irradiation by a femtosecond laser (800 nm, 50 fs, 3 mJ, 1 kHz) focused with a cylindrical lens. The laser fluence of 0.44 J/cm2 on the coated glass was only one-tenth of that on bare glass, which significantly reduced the thermal effect. Moreover, regular LIPSSs with a period as short as 100 nm could be produced efficiently. The retardance of the fabricated LIPSSs was measured to be up to 44 nm, which is eight times that of LIPSSs fabricated on bare glass. The mechanisms of such a large difference of retardance were studied by measuring the nanostructures and the concentration of In3+ ions on the cross section of nano-corrugated surface layer on bare glass and ITO-coated glass.

Indium tin oxide

10.1364/oe.402037

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Fabrication of gold micro/nanostructures by femtosecond laser direct writing and chemical etching

Journal of Nonlinear Optical Physics & Materials (2014)

Hongxin Zhang Tianqing Jia Kan Zhou Jukun Liu Donghai Feng

In this paper, we report gold micro/nanostructures fabricated by a method called lithographically patterned nanostructure by chemical etching (LPNCE). In the LPNCE method, the photoresist layer, composed of pentaerythritol triacrylate (PETA, monomer) and isopropyl thioxanthone (ITX, photoinitiator), is dropped on gold film, and subsequently polymerized via two-photon absorption of 800 nm femtosecond laser. Micro/nanostructures are fabricated by the direct laser writing. The unpolymerized photoresist is washed by isopropanol, and the exposed gold is dissolved by KI 3 aqueous solution. Finally, polymers are removed by NaOH ethanol solution. Arbitrary 2D gold micro/nanostructures can be fabricated quickly by the direct laser writing and chemical etching method. The good electro-conductibility of these micro/nanostructures guarantees wide applications in micro-electronic devices, plasmonics and biosensors, etc.

Photoresist

Isotropic etching

10.1142/s0218863514500489

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Dynamic tunable multi-channel ultra-narrowband absorber based on hollowed-out trapezoidal Si-graphene-Au metasurface

Journal of Optics (2024)

Jukun Liu Zejian Lu Hongxiang Dai Jiaqi Ju Hongwei Zhao

Abstract Dynamic tunable metasurfaces are of great interest for their optical modulation properties. This study proposes a metasurface with a rectangular hole etched from a silicon square. By converting this rectangular hole into a trapezoid, we disrupt the symmetry, transforming the symmetry-protected bound states in the continuum (BIC) into a quasi-BIC (Q-BIC) state, achieving triple Fano resonances with a maximum Q factor of 1074. The results of the multipole analysis suggest resonance modes are magnetic dipole and electric quadrupole. A typical dielectric/dielectric/metal structure is then formed by adding an Au layer below the original structure. The polarized-light absorption of the metasurface is found to be unaffected by the angle of incident light. An analysis of the thickness of the Si is studied on the effect of absorption. Eventually, a single layer of graphene is incorporated at the bottom of the Si. The dynamic modulation of the three absorption peaks of the composite metasurface is achieved by controlling the bias voltage to alter the Fermi level Ef of graphene. The Si-graphene-Au structure has a sensitivity of 252.5 nm/RIU and the maximum performance value of 126.25 RIU-1 at Ef = 1 eV. These results indicate that this composite metasurface has potential applications in the research of sensor direction.

Fano resonance

Fermi energy

10.1088/2040-8986/ad9dff

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