Apertureless scanning near field optical microscope with sub-10 nm resolution

We report on the implementation of a versatile dynamic mode apertureless scanning near field optical microscope (aSNOM) for nanoscopic investigations of optical properties at surfaces and interfaces. The newly developed modular aSNOM optomechanical unit is essentially integrable with a multitude of laser sources, homemade scanning probe microscopes (SPMs) as well as commercially available SPMs as demonstrated here. The instrument is especially designed to image opaque surfaces without a restriction to transparent substrates. In the description of the instrument we draw frequent attention to various possible artifact mechanisms, how to overcome them, and we present effective checks to ensure true near field optical contrast. Lateral optical contrast in optical amplitude and phase images below 10nm is demonstrated.

[1]  V. Sandoghdar,et al.  Nanometer Resolution and Coherent Optical Dipole Coupling of Two Individual Molecules , 2002, Science.

[2]  M. Isaacson,et al.  Development of a 500 Å spatial resolution light microscope: I. light is efficiently transmitted through λ/16 diameter apertures , 1984 .

[3]  Pascal Royer,et al.  Analysis of the interferometric effect of the background light in apertureless scanning near-field optical microscopy , 2003 .

[4]  W. Denk,et al.  Optical stethoscopy: Image recording with resolution λ/20 , 1984 .

[5]  M. Raschke,et al.  Second-harmonic generation from nanoscopic metal tips: Symmetry selection rules for single asymmetric nanostructures , 2005 .

[6]  N. V. Hulst,et al.  Visualization of mode transformation in a planar waveguide splitter by near-field optical phase imaging , 2001 .

[7]  T. D. Harris,et al.  Breaking the Diffraction Barrier: Optical Microscopy on a Nanometric Scale , 1991, Science.

[8]  Hemantha K. Wickramasinghe,et al.  Progress in scanning probe microscopy , 2000 .

[9]  F. Keilmann,et al.  Contrast of microwave near-field microscopy , 1997 .

[10]  G. Wurtz,et al.  A reflection-mode apertureless scanning near-field optical microscope developed from a commercial scanning probe microscope , 1998 .

[11]  Transmission line probe based on a bow‐tie antenna , 2001, Journal of microscopy.

[12]  Gerhard Ertl,et al.  Surface Enhanced Raman Spectroscopy: Towards Single Molecule Spectroscopy , 2000 .

[13]  Lukas Novotny,et al.  High-resolution near-field Raman microscopy of single-walled carbon nanotubes. , 2003, Physical review letters.

[14]  Yishi Jin,et al.  Control of type-D GABAergic neuron differentiation by C. elegans UNC-30 homeodomain protein , 1994, Nature.

[15]  F. Keilmann,et al.  Complex optical constants on a subwavelength scale. , 2000, Physical review letters.

[16]  V. Sandoghdar,et al.  A single gold particle as a probe for apertureless scanning near‐field optical microscopy , 2001, Journal of microscopy.

[17]  Thomas Taubner,et al.  Nanoscale-resolved subsurface imaging by scattering-type near-field optical microscopy. , 2005, Optics express.

[18]  E. Ash,et al.  Super-resolution Aperture Scanning Microscope , 1972, Nature.

[19]  S. Kawata,et al.  Near-field scanning optical microscope with a metallic probe tip. , 1994, Optics letters.

[20]  A. Boccara,et al.  Near-field optical microscope based on local perturbation of a diffraction spot. , 1995, Optics letters.

[21]  F. Keilmann,et al.  Phonon-enhanced light–matter interaction at the nanometre scale , 2002, Nature.

[22]  P. Moyer,et al.  Near-Field Optics , 1995 .

[23]  R. Bachelot,et al.  Heterodyne detection of guided waves using a scattering-type Scanning Near-Field Optical Microscope. , 2005, Optics express.

[24]  F. Keilmann,et al.  Performance of visible and mid‐infrared scattering‐type near‐field optical microscopes , 2003, Journal of microscopy.

[25]  Steven R. Emory,et al.  Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering , 1997, Science.

[26]  L. Eng,et al.  Evanescent wave scattering and local electric field enhancement at ellipsoidal silver particles in the vicinity of a glass surface. , 2004, Journal of the Optical Society of America. A, Optics, image science, and vision.

[27]  Y. Martin,et al.  Scanning Interferometric Apertureless Microscopy: Optical Imaging at 10 Angstrom Resolution , 1995, Science.

[28]  Dong Ha Kim,et al.  Apertureless near-field vibrational imaging of block-copolymer nanostructures with ultrahigh spatial resolution. , 2005, Chemphyschem : a European journal of chemical physics and physical chemistry.

[29]  S. Kawata,et al.  Metallized tip amplification of near-field Raman scattering , 2000 .

[30]  R. Zenobi,et al.  Nanoscale chemical analysis by tip-enhanced Raman spectroscopy , 2000 .

[31]  Gordon S. Kino,et al.  Optical antennas: Resonators for local field enhancement , 2003 .

[32]  A. C. Boccara,et al.  Near field optical microscopy by local perturbation of a diffraction spot , 1994 .

[33]  F. Keilmann,et al.  Infrared conductivity mapping for nanoelectronics , 2000 .

[34]  F. Keilmann,et al.  Scanning microscopy by mid-infrared near-field scattering , 1998 .

[35]  E. Synge.  XXXVIII. A suggested method for extending microscopic resolution into the ultra-microscopic region , 1928 .

[36]  Coherent near field optical microscopy , 2000 .

[37]  J. Jersch,et al.  Focusing of Laser Radiation in the Near‐field of a Tip (FOLANT) for Applications in Nanostructuring , 1997 .

[38]  K. Kern,et al.  Optical nonlinearity versus mechanical anharmonicity contrast in dynamic mode apertureless scanning near-field optical microscopy , 2005 .

[39]  Satoshi Kawata,et al.  Application of tip-enhanced microscopy for nonlinear Raman spectroscopy , 2004 .

[40]  David J. Nesbitt,et al.  Molecular fluorescence in the vicinity of a nanoscopic probe , 2001 .

[41]  Lukas Novotny,et al.  Near-field optical imaging using metal tips illuminated by higher-order Hermite–Gaussian beams , 1998 .