Jie Lin

Dalhousie University, Halifax, Nova Scotia, Canada

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Publications (21)32.98 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The generation of hollow beams with a long focal depth from a radially polarized Bessel–Gaussian beam with a second-order vortex phase and an amplitude filter is theoretically investigated by Richards–Wolf’s integral. The null intensity on the optical axis is achieved by introducing the second-order vortex. The long focal depth is a result of the amplitude filtering based on the cosine function and Euler transformation. Numerical results indicate that the focal depth of a hollow beam is improved from 0.96λ to 2.28λ with a slight increase of the transverse size for the simplest amplitude filter design. The intensity distribution twist phenomenon of the x- and y-polarized components around the optical axis due to the introducing of the vortex phase is also discussed. It is believed that the proposed scheme can be used to achieve particle acceleration and optical trapping.
    Journal of the Optical Society of America A 07/2014; 31(7). · 1.67 Impact Factor
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    ABSTRACT: A radially polarized doughnut Gaussian beam is first introduced to generate a subwavelength focal spot. The focusing characteristics of a radially polarized doughnut Gaussian beam by a lens with high numerical aperture are investigated based on the Richards–Wolf diffraction integral formulae. Numerical results indicate that a sub-wavelength focusing can be obtained for a radially polarized doughnut Gaussian incident beam. Therefore, the radially polarized doughnut Gaussian beam is of great importance in the super-resolution focusing area.
    Optics & Laser Technology 01/2014; 64:242–246. · 1.37 Impact Factor
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    ABSTRACT: The focusing performance of micro grating-Fresnel (G-Fresnel) diffractive optical element is investigated, for the first time, by finite-difference time-domain method based on rigorous electromagnetic theory. The focusing of G-Fresnel lens with different incident wavelength, focal length, and period of grating are explored. Numerical result shows that a subwavelength focusing can be achieved by G-Fresnel lens. Meanwhile, for incident beam with wavelength larger than the period of grating, the transmission of light decreases abruptly. The optical performance is governed by scattering effects from micro G-Fresnel lens. Our results provide very useful information in the field of optical imaging with high resolution and optical precision measurement.
    Optics Communications 07/2013; s 298–299:242–245. · 1.44 Impact Factor
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    ABSTRACT: We consider the focusing performance of a radially polarized sinh-Gaussian beam. The sinh-Gaussian beam can be considered as superposition of a series of eccentric Gaussian beam. Based on the Richards-Wolf formulas, high beam quality and subwavelength focusing are achieved for the radially polarized incident sinh-Gaussian beam. Therefore, sinh-Gaussian beam can be applied in the focusing system with high numerical aperture to achieve focusing with superresolution.
    Optics Express 06/2013; 21(11):13193-8. · 3.55 Impact Factor
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    ABSTRACT: A versatile method is presented for the creation of ultra-long subwavelength light needles with high-purity longitudinal polarization, uniform light tunnels of variable length and with narrow dark channel, or coaxially equidistant multi-focus with prescribed number and spacing. This is achieved by modulating the radially or azimuthally polarized vector beams using the same kind of amplitude apodization filter under a high numerical aperture aplanatic lens system. These peculiar focusing patterns may suit a variety of potential applications, such as optical trapping, particle acceleration, atom optical experiments, and near-field scanning optical microscopy.
    Journal of Modern Optics 03/2013; 60(5):378-381. · 1.16 Impact Factor
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    ABSTRACT: The effects of parameters of Bessel-Gaussian beam on the focusing characteristics are investigated in lens system with high numerical aperture. The maximal intensity shifts from focal spot in the case of larger value of parameters of BG beam. Meanwhile, the lateral resolution is increasing with the increase of value of parameters. The effect of parameters of Bessel-Gaussian beam on the achievement of optical needle is also explored. Obviously, the value of parameters is most important to obtain optical needle.
    Proc SPIE 01/2013;
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    ABSTRACT: La 62 Al 14 Cu 12 Ni 12 BMG is introduced as a substitute for silicon which was widely used as mold material for nanofabrication. For the purpose of precise microstructure replication and complete filling, effects of var-ious imprint parameters, including imprint temperature, imprint time and compression load, on form-ability of La 62 Al 14 Cu 12 Ni 12 BMG are studied and discussed. Scanning electron microscope images and results of thermal analysis are used to characterize the filling effect of La 62 Al 14 Cu 12 Ni 12 BMG. In particular, correlations between time and thermodynamic properties are presented. Despite of its high viscosity at crystallization temperature and its narrow supercooled liquid region, La 62 Al 14 Cu 12 Ni 12 BMG is proved to be a durable and promising material which can precisely replicate the patterns of silicon mold and then transfer its own patterns on Ce 69 Al 10 Cu 20 Co 1 BMG and PMMA. Ó 2012 Elsevier B.V. All rights reserved.
    Microelectronic Engineering 08/2012; 98:142-146. · 1.22 Impact Factor
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    ABSTRACT: A stop grating concept is proposed to improve polymer filling in the thermal imprinting of a micro Fresnel lens structure. The stop grating consists of line and space structures outside the Fresnel lens pattern zone area. The experimental results have proved that the stop grating can help to achieve the complete filling of a mold, at the same time acting as a stop to prevent possible damage to the mold surface relief structures during imprinting press. A computer simulation was carried out to identify the phenomena of micro-holes at the edge of imprinted pattern. By removing the cavity between the pattern area and stop grating, perfect imprinting results have been achieved.
    Journal of Micromechanics and Microengineering 06/2012; 22(6). · 1.79 Impact Factor
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    ABSTRACT: We propose in this paper to use the delayed gel point character of thiol-ene-based resist to reduce the influence of polymerization shrinkage during the replication of micro-optical elements with continuous relief by UV embossing. Experiment results indicate that this resist can be used to bring down the fabrication error to less than 2% in the vertical direction at a proper thickness of the residual resist, which is far less than that of traditional acrylate-based resist. This resist can also be used to transfer continuous relief into a fused silica substrate through reactive ion etching because of its good etching resistance.
    Applied Optics 07/2011; 50(21):4063-7. · 1.69 Impact Factor
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    ABSTRACT: The longitudinal component of a focused beam is split into two parts along the optical axis to obtain a longitudinally polarized long focal depth using amplitude filtering based on Euler transformation and a radially polarized Bessel-Gaussian beam. Numerical results indicate that long focal depth and FWHM can be easily achieved with 9λ and 0.8λ, respectively. A radially polarized beam can be converted into a longitudinally polarized beam with a conversion efficiency of 51.0%. It can therefore be believed that the proposed scheme can be widely used to generate a longitudinally polarized beam for particle acceleration, laser cutting, and optical trapping.
    Optics Letters 04/2011; 36(7):1185-7. · 3.39 Impact Factor
  • Jie Lin, Jian Liu, Jiubin Tan
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    ABSTRACT: The validity of a focal length function is investigated in designing optical element with long focal depth and high lateral resolution. The designed lenses with different starting focal length are studied. Two focusing performance measures, focal depth and lateral resolution, are presented. Comparing with the conventional lens and optical element designed by other focal length function, numerical results of the designed optics element indicate that the long focal depth and high lateral resolution are achieved. The validity of the focal length function is confirmed. Meanwhile, the designed optical element is similar with the lens with spherical aberration. It means that one can easily implement long focal depth by applying appropriate phase modulation to a lens with spherical aberration.
    Optics Communications 09/2010; 283(17):3213-3217. · 1.44 Impact Factor
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    ABSTRACT: The focal performance of the micro-axicon and the Fresnel axicon (fraxicon) are investigated, for the first time, by the rigorous electromagnetic theory and boundary element method. The micro-axicon with different angle of apex and the fraxicon with various period and angle of apex are investigated. The dark segments of the fraxicon are explored numerically. Rigorous results of focal performance of the micro-axicon and the fraxicon are different from the results given by the approximation of geometrical optics and the scalar diffraction theory. The scattering effects are dominant in the fraxicon with small size of feature. It is expected that our study can provides very useful information in analyzing the axicon in optical trapping systems.
    Optics Express 03/2009; 17(3):1466-71. · 3.55 Impact Factor
  • Jie Lin
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    ABSTRACT: The effect of illumination types on closed-boundary cylindrical microlenses (CBCMs) is investigated by rigorous electromagnetic theory and boundary element method. As a result, the focusing performance of CBCMs with different illumination types are different to each other, while the optics elements cannot be considered as pure phase element for small f-number.
    Optics Communications - OPT COMMUN. 01/2009; 282(5):748-751.
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    ABSTRACT: In order to study the validity of general focal length function in designing diffractive microlenses with long focal depth, diffractive microlenses with different f-numbers are designed using general focal length function and their focusing characteristics, such as real focal depth, real focal spot size, and diffractive efficiency, are investigated using electromagnetic theory and boundary element method. Investigation results indicate that general focal length function can be used to achieve long focal depth in designing diffractive microlenses, even twice over than those of conventional diffractive microlenses with similar parameters.
    Proc SPIE 10/2008;
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    ABSTRACT: In this paper, the general focal length function is used to design two-dimensional closed-boundary cylindrical microlenses (CBCMs) with long focal depth. The focusing characteristics of the designed microlenses is investigated by rigorous electromagnetic theory and the boundary element method. A number of focusing performance measures of the designed microlenses, such as the real focal depth, the focal depth range, the focal spot size, and the diffraction efficiency, are presented in detailed. As comparison, the focusing performance of the conventional lenses with the same parameters are investigated simultaneously. Our analysis indicates that the general focal length function is valid in designing CBCMs with larger extended focal depth. Comparing with the open-boundary cylindrical microlenses (OBCMs) designed using the same focal length function, we also find that the designed CBCMs with low f-number exhibit superiority of long focal depth.
    Optics Communications 01/2008; 281(17):4188-4193. · 1.44 Impact Factor
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    ABSTRACT: In this paper, we investigate the focal performance of closed-boundary cylindrical microlenses (CBCMs) made of anisotropic uniaxial crystal based on rigorous electromagnetic theory and the boundary element method (BEM). For both TE and TM polarizations, focal performances of the anisotropic CBCMs with different f-numbers are studied in detail. The influence of illumination type on focal performances of CBCMs are also considered. Several focal performance quantities, such as the real focal position, the focal spot size, the diffraction efficiency and the normalized transmitted power, are presented. Numerical results indicate that the focal performance of anisotropic CBCMs made of uniaxial crystal differs greatly in the case of different polarizations. Especially, there exists a large focal shift, which is due to the birefringence effect of a uniaxial crystal. In contrast, for conventional isotropic CBCMs, the focal characteristics for different polarizations are similar. Meanwhile, our analysis indicates that the focal performances of CBCMs with small f-number are sensitive to illumination type. It is expected that the CBCMs made of uniaxial crystal should be used as a micropolarization optical filter in micro-optical systems and also offer useful help in application of CBCMs with small f-number.
    Optics & Laser Technology 11/2007; · 1.37 Impact Factor
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    ABSTRACT: We demonstrate that hollow Gaussian beams can be obtained from Fourier transform of the differentials of a Gaussian beam, and thus they can be generated by spatial filtering in the Fourier domain with spatial filters that consist of binomial combinations of even-order Hermite polynomials. A typical 4f optical system and a Michelson interferometer type system are proposed to implement the proposed scheme. Numerical results have proved the validity and effectiveness of this method. Furthermore, other polynomial Gaussian beams can also be generated by using this scheme. This approach is simple and may find significant applications in generating the dark hollow beams for nanophotonic technology.
    Optics Letters 09/2007; 32(15):2076-8. · 3.39 Impact Factor
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    ABSTRACT: A general focal length function is proposed to design microlenses with long extended focal depth and high lateral resolution. The focal performance of the designed microlenses, including the actual focal depth, the focal spot size, and the diffraction efficiency, is calculated by rigorous electromagnetic theory and the boundary-element method for several f-numbers. In contrast to conventional microlenses, the numerical results indicate that the designed microlenses can exhibit long extended focal depth and good focal performance. It is expected that the long focal length function will be widely used to design microlenses with long focal depth characteristics.
    Journal of the Optical Society of America A 07/2007; 24(6):1747-51. · 1.67 Impact Factor
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    ABSTRACT: Instead of the existing zero-thickness model (ZTM), the finite-thickness model (FTM) is employed to designs of closed-boundary cylindrical microlenses (CBCMs) with small f-numbers based on the wave-front interference principle. To demonstrate the superiority of the FTM to the ZTM in the design of CBCMs, focal performance of all the designed microlenses is investigated by the rigorous boundary element method (BEM). For CBCMs with small f-numbers, numerical results by the BEM reveal that the designed CBCMs by using the FTM possess better focal performance than the designed CBCMs by using the ZTM, such as a more exact real focal position, a smaller focal spot size, and a higher diffraction efficiency.
    Optics Communications 01/2007; 273(1):43-49. · 1.44 Impact Factor
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    ABSTRACT: In this paper, we investigated the focal performance of the dual-closed-surface microlens arrays (DCSMAs) based on rigorous electromagnetic theory and boundary element method (BEM) in the case of TE polarization. The DCSMAs are designed with different substrate thickness and different distance between microlenses. DCSMAs designed according to different wavelengths are surveyed. The DCSMAs with different incident angles are also studied. Several focusing performance measures, such as the focal spot size, the focal position on the preset focal plane, the diffraction efficiency and the normalized transmitted power, are presented. Numerical results indicate the DCSMAs with different parameters can implement focusing beams and the focal performance of DCSMAs is easily influenced by the substrate thickness and the incident wavelength. Furthermore, the optimal thickness for the maximal diffraction efficiency of the DCSMAs is given. It is expected that the DCSMAs may be used as a parallel processing device in micro-optics systems.
    Optics Communications 01/2007; 278(2):232-239. · 1.44 Impact Factor

Publication Stats

66 Citations
32.98 Total Impact Points

Institutions

  • 2014
    • Dalhousie University
      • Department of Electrical & Computer Engineering
      Halifax, Nova Scotia, Canada
  • 2006–2013
    • Harbin Institute of Technology
      • • School of Materials Science and Engineering
      • • Institute of Ultra-Precise Opto-electric Instrumental Engineering
      • • Department of Physics
      Charbin, Heilongjiang Sheng, China
  • 2012
    • Chinese Academy of Sciences
      Peping, Beijing, China