Focal length modulation based on a metallic slit surrounded with grooves in curved depths

According to the numerical calculation, the relative phase of emitting light scattered by surface plasmon in a single subwavelength metallic groove can be modulated by the groove depth. The focal length of the slit-groove-based focusing structures can be adjusted in certain value if the groove depths are arranged in traced profile. With the regulation of the groove depth profile, it is possible to modify the focus position in the precision of nanoscale without increasing the size of the nanodevice. The simulation results verify that the method is effective for the design of nano-optical devices such as optical microprobes.

[1]  Luis Martín-Moreno,et al.  Focusing light with a single subwavelength aperture flanked by surface corrugations , 2003 .

[2]  Changtao Wang,et al.  Beam manipulating by metallic nano-slits with variant widths. , 2005, Optics express.

[3]  Xiangang Luo,et al.  Surface plasmon resonant interference nanolithography technique , 2004 .

[4]  T. Ebbesen,et al.  Channel plasmon-polariton guiding by subwavelength metal grooves. , 2005, Physical review letters.

[5]  Christopher Robert Lawrence,et al.  Surface-topography-induced enhanced transmission and directivity of microwave radiation through a subwavelength circular metal aperture , 2004 .

[6]  H. Lezec,et al.  Theory of highly directional emission from a single subwavelength aperture surrounded by surface corrugations. , 2003, Physical review letters.

[7]  Chih-Kung Lee,et al.  Physical origin of directional beaming emitted from a subwavelength slit , 2005 .

[8]  Willie J Padilla,et al.  Composite medium with simultaneously negative permeability and permittivity , 2000, Physical review letters.

[9]  W. A. Murray,et al.  Surface plasmon polaritons and their role in the enhanced transmission of light through periodic arrays of subwavelength holes in a metal film. , 2004, Physical review letters.

[10]  Changtao Wang,et al.  Surface electromagnetic wave excitation and diffraction by subwavelength slit with periodically patterned metallic grooves. , 2006, Optics express.

[11]  W. Barnes,et al.  Surface plasmon subwavelength optics , 2003, Nature.

[12]  H. Lezec,et al.  Multiple paths to enhance optical transmission through a single subwavelength slit. , 2003, Physical review letters.

[13]  H. Lezec,et al.  Extraordinary optical transmission through sub-wavelength hole arrays , 1998, Nature.

[14]  R A Linke,et al.  Beaming Light from a Subwavelength Aperture , 2002, Science.