Subwavelength focusing of light by a tapered microtube

Jian Fu; Hongtao Dong; Wei Fang
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p041114
Academic Journal
We propose a mechanism for subwavelength focusing at optical frequencies based on the use of a tapered microtube fabricated from a glass capillary tube. Using coherent illumination at 671 nm and a near-field scanning optical microscope probe which was mounted on a three-axis piezonanopositioning stage, a sequence of two-dimensional intensity profiles were obtained. Our experimental results reveal the smallest focal spot with a near diffraction-limited full width at half-maximum of ∼435 nm (0.65λ) at a distance of ∼1.47 μm (2.2λ) from the output end face of microtube. The experimental results are in agreement with our numerical simulation.


Related Articles

  • Mapping electromagnetic fields near a subwavelength hole. Permyakov, D.; Mukhin, I.; Shishkin, I.; Samusev, A.; Belov, P.; Kivshar, Yu. // JETP Letters;Aug2014, Vol. 99 Issue 11, p622 

    We study, both experimentally and theoretically, the scattering of electromagnetic waves by a subwavelength hole fabricated in a thin metallic film. We employ the scanning near-field optical microscopy in order to reconstruct experimentally the full three-dimensional structure of the...

  • Photonic devices: Coaxing light into small spaces. Thio, Tineke // Nature Nanotechnology;Mar2007, Vol. 2 Issue 3, p136 

    The author presents that in nanophotonics, a technique called near-field scanning optical microscopy (NSOM) offers spatial resolution several times smaller than the wavelength of light. Information is provided to the researchers through NSOM which the conventional optical microscopy does not...

  • TSOM Method for Nanoelectronics Dimensional Metrology. Attota, Ravikiran // AIP Conference Proceedings;11/15/2011, Vol. 1395 Issue 1, p57 

    Through-focus scanning optical microscopy (TSOM) is a relatively new method that transforms conventional optical microscopes into truly three-dimensional metrology tools for nanoscale to microscale dimensional analysis. TSOM achieves this by acquiring and analyzing a set of optical images...

  • Apertureless near-field optical microscope. Zenhausern, F.; O'Boyle, M.P. // Applied Physics Letters;9/26/1994, Vol. 65 Issue 13, p1623 

    Demonstrates a method on near-field optical microscope extending to the nanometer regime. Measurement of the scattered electric field from the end of a sharp silicon tip; Detection of the vibrational signal at radio frequency; Application of spherical light scattering from a tip end of a...

  • Propagation of femtosecond optical pulses through uncoated and metal-coated near-field fiber probes. Mu¨ller, Roland; Lienau, Christoph // Applied Physics Letters;6/5/2000, Vol. 76 Issue 23 

    The spatiotemporal evolution of a 10-femtosecond light pulse (λ=805 nm) propagating through uncoated and metal-coated near-field fiber probes is analyzed theoretically within a two-dimensional model for s and p polarization of the incident field. Internal reflection inside uncoated fiber...

  • Polarization effects in reflection-mode scanning near-field optical microscopy. Durkan, C.; Shvets, I.V. // Journal of Applied Physics;2/15/1998, Vol. 83 Issue 4, p1837 

    Presents an experiment conducted to demonstrate how optical image contrast of light emitted from an aperture-type scanning near-field optical microscopy (SNOW) can be altered on reflection from a metal surface. Information on the field components in the vicinity of a SNOW aperature; Indepth...

  • Simultaneous topographical and optical characterization of near-field optical aperture probes by way of imaging fluorescent nanospheres. Höppener, C.; Molenda, D.; Fuchs, H.; Naber, A. // Applied Physics Letters;2/25/2002, Vol. 80 Issue 8, p1331 

    Introduces method for simultaneous topographical and optical characterization of aperture probes for scanning near-field optical microscopy. Near-field optical fluorescence image of nanosphere maps; Intensity distribution of lights at the end of face of the probe; Use of the method to control a...

  • Real-space mapping of nanoplasmonic hotspots via optical antenna-gap loading. Mastel, S.; Grefe, S. E.; Cross, G. B.; Taber, A.; Dhuey, S.; Cabrini, S.; Schuck, P. J.; Abate, Y. // Applied Physics Letters;9/24/2012, Vol. 101 Issue 13, p131102 

    Plasmonic hotspots located in the nanogaps of infrared optical antennas are mapped in the near-field. The enhanced evanescent field resonance is shown to depend strongly on excitation wavelength, the excitation and detection laser polarization, and gap size. In addition, we demonstrate that in...

  • Terahertz Dielectric Sensor Based on Novel Hexagon Meta-Atom Cluster. Naeem, Nadeem; Ismail, Alyani; Hassan Alhawari, Adam Reda; Mahdi, Mohd Adzir // Applied Computational Electromagnetics Society Journal;Sep2015, Vol. 30 Issue 9, p996 

    In this paper, we report meta-atom sensor based on planar hexagon split ring resonators. The subwavelength structure is designed to operate in terahertz frequency band. A modified version of split ring resonator geometry is simulated for sensing dielectric changes by placing thin dielectric...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics