French Patent FR 2 803 950 A1(14 Jan 2000)
European patent (EP 1247301) and international patent PCT (WO 0152329),
"Vertical metal-semiconductor microresonator photodetecting device and production method thereof",
F Pardo, S Collin, R Teissier, J-L Pelouard

US patent 5,973,316 (26oct1999)
Japanese Patent P3008931 (14Feb2000)
"Sub-wavelength aperture arrays with enhanced light transmission",
T.W. Ebbesen, H.J. Lezec, H.F. Ghaemi, T. Thio, P.A. Wolff.

US Patent 6,040,936 (21 Mar2000)
"Optical transmission control apparatus utilising metal films perforated with subwavelength-diameter holes",
T.J. Kim, T. Thio, T.W. Ebbesen.

US Patent 6,052,238 (18Apr2000)
"Near-field scanning optical microscope having sub-wavelength aperture array for enhanced light transmission",
T.W. Ebbesen, H.F. Ghaemi, Tineke Thio, P.A. Wolff.

US patent 6,236,033 (22May2001)
"Enhanced optical transmission apparatus utilizing metal films having apertures and periodic surface topography",
T.W. Ebbesen, D.E. Grupp, T. Thio and H.J. Lezec.

US Patent 6,285,020 (4Sep2001)
"Enhanced optical transmission apparatus with improved inter-surface coupling",
T.J. Kim, A. Krishnan, T. Thio, H.J. Lezec, T.W. Ebbesen.