G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/15 (2006.01) G02B 1/02 (2006.01) G02F 1/153 (2006.01) G02F 1/163 (2006.01)
Patent
CA 2597095
Tunable photonic crystals offer an interesting possibility to adjust the photonic band gap (PBG) as per requirement. Various methods of achieving this have been tried that include polarization of liquid crystals, thermal effects and more. Chromogenic devices provided in accordance with the present invention include combinations and subcombinations of electrochromic, photochromic, thermochromic devices featuring TMO based inverse opals having tunable photonic band gaps (PBG) for certain frequencies Electrochromic (EC) materials in which a reversible optical property change can be induced with the application of a small electric field offer a novel possibility to tune the PBG in a controlled and reversible way. The reversible chemical change and the ensuing change of optical constants in these periodically arranged EC materials make the PBG tunability possible In a recent work we have demonstrated for the first time the PBG tunability of EC materials deposited in the form of periodic inverse opals. This earlier work was carried out with the well known Tungsten Trioxide (WO3) EC thin films into which lithium intercalation was done by a dry lithiation method In the present work we report on the fabrication of a simple tunable photonic crystal device based on electrochemical insertion/extraction of lithium based on WO3 inverse opals In alternative embodiments, any suitable transparent conductor can be utilised instead of Indium Tin Oxide (ITO); any suitable electrochromic transition metal oxide, such as for example Molybdenum Oxide (MoO3), Vanadium Pentoxide (V2O5), Titanium Oxide (TiO2), Chromium Oxide (Cr2O3), or Cerium Oxide (CeO2)can be utilised instead of Tungsten Oxide (WO3), and any suitable electrolyte solution can be utilised instead of LiClO4 in Polypropylene Carbonate (LiClO4/PC) solution
Ashrit Pandurang
Kuai Sulan
Fogler Rubinoff Llp
Universite de Moncton
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