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Numerical analysis of the spectral response of an NSOM measurement



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Birck Nanotechnology Center Birck and NCN Publications Purdue Libraries Year Numerical analysis of the spectral response of an NSOM measurement Edward C Kinzel Purdue Xianfan Xu University kinzele purdue edu Nanotechnology Center School of Materials Engineering Purdue University xxu purdue edu This paper is posted at Purdue e Pubs Birck http docs lib purdue edu nanopub 112 Appl Phys B 2008 93 47 54 DOI 10 1007 s00340 008 3178 0 Numerical analysis of the spectral response of an NSOM measurement E C Kinzel X Xu Received 29 June 2008 Published online 30 August 2008 Springer Verlag 2008 Abstract Near field Scanning Optical Microscopy NSOM is a powerful tool for investigating optical field with resolution greater than the diffraction limit In this work we study the spectral response that would be obtained from an aperture NSOM system using numerical calculations The sample used in this study is a bowtie nanoaperture that has been shown to produce concentrated and enhanced field The near and far field distributions from a bowtie aperture are also calculated and compared with what would be obtainable from a NSOM system The results demonstrate that it will be very difficult to resolve the true spectral content of the near field using aperture NSOM On the other hand the far field response may be used as a guide to the near field spectrum PACS 07 79 Fc 68 37 Uv 42 79 Gn 1 Introduction Near field Scanning Optical Microscopy NSOM is a powerful tool for peering beyond the diffraction limit It plays an increasingly important role for the investigation of nanoscale devices that manipulate light on length scales that do not effectively couple into the far field such as subwavelength apertures and plasmonic structures 1 2 One of the principle advantages of NSOM is the potential to resolve the spectral content in the near field in addition to resolving optical signals with high spatial resolution E C Kinzel X Xu School of Mechanical Engineering and Birck Nanotechnology Center Purdue



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