Jie Lin

Dalhousie University, Halifax, Nova Scotia, Canada

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Publications (27)43.3 Total impact

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    ABSTRACT: A longitudinally polarized optical chain is generated in a proposed 4π focusing system. The radially polarized Bessel-Gaussian incident beam is modulated by a complex amplitude filter. Their focusing performance is investigated using the Debye integral. Longitudinally polarized focusing spots with uniform intensity, high axial resolution and small spot volume are achieved in the proposed scheme. The number of the focusing spots in the optical chain is controllable by adjusting the complex amplitude filter. As an example, a longitudinally polarized optical chain with seven uniform intensity focusing spots is obtained. The volume of each focusing spot is reduced by about seven times and the axial resolution is only one-fourth of that in a single lens system with the same parameters. The influence of optical axes mismatching and foci shifting on the focusing performance is also investigated. The focusing system with the complex amplitude filter permits a large foci shifting because of the elongated depth of focus. It is expected that the research results can be used in the field of confocal microscopy, optical trapping and manipulating.
    Optics Communications 03/2015; 340. DOI:10.1016/j.optcom.2014.11.095 · 1.54 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 12/2014; 64:242–246. DOI:10.1016/j.optlastec.2014.05.019 · 1.65 Impact Factor
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    ABSTRACT: In this paper, a double-layer aperiodic metallic grating is designed and the focusing performance is numerically researched using the finite-difference time-domain method. A sub-wavelength focusing spot is achieved and the depth of focus is twice the length of the incident wavelength. With its ease of fabrication, the designed aperiodic double-layer metallic grating has great potential in applications such as data storage, laser direct writing and optical probe.
    Microelectronic Engineering 07/2014; 123:112-116. DOI:10.1016/j.mee.2014.05.033 · 1.34 Impact Factor
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    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). DOI:10.1364/JOSAA.31.001395 · 1.45 Impact Factor
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    ABSTRACT: An optimizing method of vapor-phase depositing anti-adherence layer in UV-embossing through controlling temperature is proposed to enhance the quality of demolding process. Experimental results show that, under low deposited temperature, the quality of anti-adherence layer is better than that under high temperature. Under low temperature, the contact angle of water, methylene iodide, and formamide is 119°, 101°, and 105°, and surface free energy is 8.5mJ/m2, which is similar to its ideal value. Film thickness is equal to its molecule length. XPS experiments mean that monolayer under low temperature is more orderly than that under high temperature. And crack character of low temperature is also better than that of high temperature.
    2013 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO); 08/2013
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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. DOI:10.1016/j.optcom.2013.02.041 · 1.54 Impact Factor
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    ABSTRACT: Through modulating the Bessel-Gaussian radially polarized vector beam by the cosine synthesized filter under a reflection paraboloid mirror system with maximum focusing semi-angle of pi/2, arbitrary-length super-Gaussian optical needles are created with consistent beam size of 0.36 lambda (full width at half maximum) and the electric field being pure longitudinally polarized (polarization conversion efficiency greater than 99%). Numerical calculations show that the on-axis intensity distributions are super-Gaussian, and the peak-valley intensity fluctuations are all within 1% for 4 lambda, 6 lambda, 8 lambda, and 10 lambda long light needles. The method remarkably improves the nondiffraction beam quality, compared with the sub-wavelength Gaussian light needle, which is generated by a narrow-width annular paraboloid mirror. Such a light beam may suit potential applications in particle acceleration, optical trapping, and microscopy. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
    Optical Engineering 07/2013; 52(7):074104. DOI:10.1117/1.OE.52.7.074104 · 0.96 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. (C) 2013 Optical Society of America
    Optics Express 06/2013; 21(11):13193-8. DOI:10.1364/OE.21.013193 · 3.53 Impact Factor
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    ABSTRACT: Free volume theory and a model of polymerization kinetics are introduced to predict and analyze the curing shrinkage and kinetic parameters of an acrylate-based ultraviolet-embossing resist. Curing shrinkage tests have been designed and performed to verify the accuracy of the model. The experimental results are in good agreement with the simulated results of the conversion behavior. The reaction coefficients of polymerization predicted by this model are essentially correct when compared to the classical experimental values. Moreover, the dynamic shrinkage during polymerization determined experimentally matches the simulated result predicted by our model. (C) 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
    Journal of Micro/ Nanolithography, MEMS, and MOEMS 04/2013; 12(2):023005. DOI:10.1117/1.JMM.12.2.023005 · 1.21 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. DOI:10.1080/09500340.2013.778343 · 1.17 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.
    Proceedings of SPIE - The International Society for Optical Engineering 01/2013; DOI:10.1117/12.2011642 · 0.20 Impact Factor
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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. DOI:10.1016/j.mee.2012.07.065 · 1.34 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). DOI:10.1088/0960-1317/22/6/065018 · 1.73 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. DOI:10.1364/AO.50.004063 · 1.78 Impact Factor
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    ABSTRACT: Using a general focal-length function, two-dimensional long-focal-depth (LFD) metallic cylindrical focusing micromirrors (MCFMs) are designed and the focal performance is systematically investigated based on rigorous electromagnetic theory and the boundary element method. For a positive preset focal depth, simulation results reveal that the designed MCFMs still possess an LFD property and high lateral resolution even when the f-number is reduced to f/0.3. On the other hand, through setting the preset focal depth to be negative, increased lateral resolution is obtained, compared with the conventional MCFM. In addition, under multiwavelength illumination, a large common LFD region is demonstrated for the designed LFD MCFMs, which is due to the intrinsic achromatic property of reflective systems.
    Journal of the Optical Society of America A 06/2011; 28(6):1051-7. DOI:10.1364/JOSAA.28.001051 · 1.45 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. DOI:10.1364/OL.36.001185 · 3.18 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. DOI:10.1016/j.optcom.2010.04.048 · 1.54 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 03/2009; 282(5):748-751. DOI:10.1016/j.optcom.2008.11.027 · 1.54 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. DOI:10.1364/OE.17.001466 · 3.53 Impact Factor
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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.
    Proceedings of SPIE - The International Society for Optical Engineering 10/2008; DOI:10.1117/12.813382 · 0.20 Impact Factor

Publication Stats

145 Citations
43.30 Total Impact Points

Institutions

  • 2014–2015
    • 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