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  Physics Express 2011, 1: 5
  Research Article
 
All–optical magnetic recording using high NA lens axicon and a binary phase plate
  K.B.Rajesha, P.M.Anbarasanb, K.Gokulakrishanc, G.Mohan Kumarc, T.V.S. Pillaia, G.Mahadevand  
     
a Department of Physics, Anna University of Technology Tirunelveli, Tamilnadu, India
b Department of Physics, Periyar University, Salem, Tamilnadu, India
c Department of Electrical and Electronic Engineering, Anna University of Technology Tirunelveli, India
d Department of Mathematics, Anna University of Technology Tirunelveli, Tamilnadu, India

   
  Abstract  
  We propose to use pure-phase filter in combination with high NA lens axicon to achieve a uniform magnetization depth. With this kind of system, the expected DOF can be 5-12 times greater than that of the original system, and the spot size will be smaller than that of the original system.
     
  Keywords  
  Lens axicon; Circularly polarized beam; Ultrafast magneto optic recording  
     
   
   
   
   
     

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