Yuichi Kozawa

Summary

Affiliation: Tohoku University
Country: Japan

Publications

  1. doi request reprint Lateral resolution enhancement of laser scanning microscopy by a higher-order radially polarized mode beam
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    Opt Express 19:15947-54. 2011
  2. ncbi request reprint Single higher-order transverse mode operation of a radially polarized Nd:YAG laser using an annularly reflectivity-modulated photonic crystal coupler
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 33:2278-80. 2008
  3. ncbi request reprint Dark-spot formation by vector beams
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Sendai, Japan
    Opt Lett 33:2326-8. 2008
  4. doi request reprint Focusing of higher-order radially polarized Laguerre-Gaussian beam
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 29:2439-43. 2012
  5. doi request reprint Optical trapping of micrometer-sized dielectric particles by cylindrical vector beams
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba ku, Sendai 980 8577, Japan
    Opt Express 18:10828-33. 2010
  6. doi request reprint Demonstration and selection of a single-transverse higher-order-mode beam with radial polarization
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 27:399-403. 2010
  7. doi request reprint Diffractive properties of obstructed vector Laguerre-Gaussian beam under tight focusing condition
    Sunil Vyas
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 28:1387-94. 2011
  8. doi request reprint Self-healing of tightly focused scalar and vector Bessel-Gauss beams at the focal plane
    Sunil Vyas
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 28:837-43. 2011
  9. ncbi request reprint Amplification of a radially polarized laser beam using an Yb-doped double-clad fiber
    Tatsuya Chubachi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 34:716-8. 2009
  10. ncbi request reprint Generation of a radially polarized laser beam by use of the birefringence of a c-cut Nd:YVO4 crystal
    Kazuhiro Yonezawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 31:2151-3. 2006

Collaborators

  • Sunil Vyas
  • Shunichi Sato
  • Kazuhiro Yonezawa
  • Tatsuya Chubachi
  • Hikaru Kawauchi

Detail Information

Publications17

  1. doi request reprint Lateral resolution enhancement of laser scanning microscopy by a higher-order radially polarized mode beam
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    Opt Express 19:15947-54. 2011
    ..This method can extend the capability of conventional laser scanning microscopes without modification of the system, with the exception of the addition of the liquid crystal devices in the optical path...
  2. ncbi request reprint Single higher-order transverse mode operation of a radially polarized Nd:YAG laser using an annularly reflectivity-modulated photonic crystal coupler
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 33:2278-80. 2008
    ..A double-ring-shaped radially polarized TM(02) mode beam is stably generated...
  3. ncbi request reprint Dark-spot formation by vector beams
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Sendai, Japan
    Opt Lett 33:2326-8. 2008
    ..The radially polarized TM02-mode beam is predicted to form a dark spot solely by an axial electric field...
  4. doi request reprint Focusing of higher-order radially polarized Laguerre-Gaussian beam
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 29:2439-43. 2012
    ..The latter forms a dominant small spot of longitudinal electric field component near the focus, while the former mainly contributes to a weak annular pattern of radial component...
  5. doi request reprint Optical trapping of micrometer-sized dielectric particles by cylindrical vector beams
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba ku, Sendai 980 8577, Japan
    Opt Express 18:10828-33. 2010
    ..On the other hand, the azimuthally polarized beam had a higher transverse trapping efficiency than the radially polarized beam. These results are consistent with numerical predictions...
  6. doi request reprint Demonstration and selection of a single-transverse higher-order-mode beam with radial polarization
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 27:399-403. 2010
    ..As predicted by theoretical analysis [A. A. Tovar, J. Opt. Soc. Am. A 15, 2705 (1998)], the intensity distribution and propagation characteristics of the higher-order radially polarized beams are expressed by a Laguerre-Gaussian formula...
  7. doi request reprint Diffractive properties of obstructed vector Laguerre-Gaussian beam under tight focusing condition
    Sunil Vyas
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 28:1387-94. 2011
    ..A comparative study of the focusing and diffractive properties of vector Laguerre-Gaussian and vector Bessel-Gaussian beams has also been performed...
  8. doi request reprint Self-healing of tightly focused scalar and vector Bessel-Gauss beams at the focal plane
    Sunil Vyas
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    J Opt Soc Am A Opt Image Sci Vis 28:837-43. 2011
    ..The effect of the size of the obstacle on recovery of polarization and intensity distribution is studied. The role of the beam size at the pupil plane is also discussed...
  9. ncbi request reprint Amplification of a radially polarized laser beam using an Yb-doped double-clad fiber
    Tatsuya Chubachi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 34:716-8. 2009
    ..The amplified spontaneous emission becomes negligible with increasing input power. The measured slope efficiency is 48%, and the output power is 1.1 W...
  10. ncbi request reprint Generation of a radially polarized laser beam by use of the birefringence of a c-cut Nd:YVO4 crystal
    Kazuhiro Yonezawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    Opt Lett 31:2151-3. 2006
    ..The beam was very stable even at low power output and is expected to be a promising radially polarized laser source because of its excellent simplicity...
  11. doi request reprint Polarization singularities in superposition of vector beams
    Sunil Vyas
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    Opt Express 21:8972-86. 2013
    ..Novel intensity and polarization patterns obtained from the superposition of two vector LG beams may find applications in the field of molecular imaging, optical manipulation, atom optics, and optical lattices...
  12. doi request reprint Radially polarized annular beam generated through a second-harmonic-generation process
    Shunichi Sato
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Sendai 980 8577, Japan
    Opt Lett 34:3166-8. 2009
    ..The annular intensity pattern of the second-harmonic wave had a nearly sixfold symmetry as a result of the nonlinear susceptibility tensor of the BBO crystal. The width of the annulus was as narrow as less than 1/40th of its radius...
  13. ncbi request reprint Hollow vortex beams
    Shunichi Sato
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    J Opt Soc Am A Opt Image Sci Vis 26:142-6. 2009
    ..Similar discussion is applied for different vortex beams, which are expressed by linear combination of radially and azimuthally polarized beams. Calculations of intensity profiles across the focus are also presented...
  14. ncbi request reprint Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam
    Hikaru Kawauchi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    Opt Lett 32:1839-41. 2007
    ..Three-dimensional optical trapping was expected for particles with a larger index of refraction and for objectives with a smaller numerical aperture...
  15. ncbi request reprint Sharper focal spot formed by higher-order radially polarized laser beams
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
    J Opt Soc Am A Opt Image Sci Vis 24:1793-8. 2007
    ..Compared with an R-TEM01* beam focusing in a limit of NA=1, the full width at half-maximum values of the focal spot for an R-TEM11* beam are decreased by 13.6% for the longitudinal component and 25.8% for the total intensity...
  16. ncbi request reprint Focusing property of a double-ring-shaped radially polarized beam
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2 1 1, Aoba ku, Sendai 980 8577, Japan
    Opt Lett 31:820-2. 2006
    ..3, the longitudinal component disappeared at the focal point, owing to destructive interference. This dark area surrounded by an intense light field was of the order of the wavelength, with excellent intensity symmetry...
  17. ncbi request reprint Generation of a radially polarized laser beam by use of a conical Brewster prism
    Yuichi Kozawa
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba ku, Sendai, Japan
    Opt Lett 30:3063-5. 2005
    ..By combining two prisms we obtained a conical Brewster prism without beam divergence owing to refraction. A radially polarized TEM01* (R-TEM01*) mode laser beam was demonstrated when this prism was used inside a Nd:YAG laser cavity...