Ultrafast optical switching by photoinduced electrochromism in cast films of polymeric 4,4′-bipyridinium salts with di-iodides

Femtosecond dynamics of color changes due to photoinduced electron transfer and reverse reactions in polymeric 4,4′-bipyridinium di-iodides salts were studied with a fs laser pump–probe technique. The characteristic color change was shown to take place in less than 1 ps by fs-laser excitation of an ion-pair charge-transfer band, which may be applied to ultrafast THz all-optical switching devices using visible light.

[1]  T. Nagamura,et al.  Ultrafast Colour Changes in Organic Thin Films Based on Photoinduced Electron Transfer Reactions , 1994 .

[2]  T. Nagamura,et al.  Photoinduced electrochromism in monolayer assemblies of ion pair change transfer complexes of 4,4′-bipyridinium ions , 1989 .

[3]  T. Nagamura,et al.  POLYMERIC CHARGE-TRANSFER COMPLETES SHOWING PERSISTENT AND REVERSIBLE COLOUR CHANGES BY PHOTOINDUCED ELECTRON TRANSFER , 1991 .

[4]  Toshihiko Nagamura,et al.  Ultrafast all-optical switch using complex refractive index changes of thin films containing photochromic dye , 1997 .

[5]  Toshihiko Nagamura,et al.  Ultrafast photon-mode recording based on photoinduced electron transfer in ion-pair charge-transfer complexes of 4,4'-bipyridinium salts , 1995, Other Conferences.

[6]  N. Kitamura.  Photochemical Processes in Organized Molecular Systems , 1991 .

[7]  T. Nagamura.  Optical memory by novel photoinduced electrochromism , 1993 .

[8]  Toshihiko Nagamura,et al.  NOVEL ALL OPTICAL LIGHT MODULATION BASED ON COMPLEX REFRACTIVE INDEX CHANGES OF ORGANIC DYE-DOPED POLYMER FILM UPON PHOTOEXCITATION , 1996 .

[9]  T. Nagamura,et al.  Reversible and steady photogeneration of 4,4′-bipyridinium radical cations via the excitation of ion-pair charge-transfer complexes between 4,4′-bipyridinium and tetrakis-[3,5-bis(trifluoromethyl)phenyl]borate in organic solutions , 1988 .

[10]  T. Nagamura,et al.  Optical data storage by novel photoelectrochromic polymer , 1992 .

[11]  T. Nagamura,et al.  Ultrafast photon‐mode recording by novel photochromic polymer via photoinduced electron transfer , 1993 .

[12]  T. Nagamura,et al.  STABILIZATION OF OPTICAL RECORDING BY PHOTOELECTROCHROMIC POLYMER FILMS CONTAINING 4, 4′-BIPYRIDINIUM SALTS , 1992 .

[13]  T. Nagamura,et al.  Molecular orientation of photogenerated radicals in novel photoelectrochromic Langmuir-Blodgett films , 1992 .

[14]  T. Nagamura,et al.  Persistent and Reversible Photoreduction of 4,4′-Bipyridinium Ions via Excitation of their Ion-Pair Charge-Transfer Complexes with Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate in the Crystalline State , 1989 .