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 30.06.2007   Карта сайта     Language По-русски По-английски
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30.06.2007

Nature 447, 1098-1101 (28 June 2007) | doi:10.1038/nature05921; Received 20 October 2006; Accepted 11 May 2007



Tunable nanowire nonlinear optical probe


Yuri Nakayama1,6,7, Peter J. Pauzauskie1,5,7, Aleksandra Radenovic2,4,7, Robert M. Onorato1,7, Richard J. Saykally1,4, Jan Liphardt2,3,4 & Peidong Yang1,5



  1. Department of Chemistry,
  2. Department of Physics, and,
  3. Biophysics Graduate Group, University of California
  4. Physical Biosciences Division and,
  5. Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  6. Materials Laboratories, Sony Corporation, 4-16-1 Okata, Atsugi-shi, Kanagawa 243-0021, Japan
  7. These authors contributed equally to this work.


Correspondence to: Jan Liphardt2,3,4Peidong Yang1,5 Correspondence and requests for materials should be addressed to J.L. (Email: liphardt@physics.berkeley.edu) or P.Y. (Email: p_yang@berkeley.edu).





One crucial challenge for subwavelength optics has been the development of a tunable source of coherent laser radiation for use in the physical, information and biological sciences that is stable at room temperature and physiological conditions. Current advanced near-field imaging techniques using fibre-optic scattering probes1, 2 have already achieved spatial resolution down to the 20-nm range. Recently reported far-field approaches for optical microscopy, including stimulated emission depletion3, structured illumination4, and photoactivated localization microscopy5, have enabled impressive, theoretically unlimited spatial resolution of fluorescent biomolecular complexes. Previous work with laser tweezers6, 7, 8 has suggested that optical traps could be used to create novel spatial probes and sensors. Inorganic nanowires have diameters substantially below the wavelength of visible light and have electronic and optical properties9, 10 that make them ideal for subwavelength laser and imaging technology. Here we report the development of an electrode-free, continuously tunable coherent visible light source compatible with physiological environments, from individual potassium niobate (KNbO3) nanowires. These wires exhibit efficient second harmonic generation, and act as frequency converters, allowing the local synthesis of a wide range of colours via sum and difference frequency generation. We use this tunable nanometric light source to implement a novel form of subwavelength microscopy, in which an infrared laser is used to optically trap and scan a nanowire over a sample, suggesting a wide range of potential applications in physics, chemistry, materials science and biology.




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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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