Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2007-07-30
2010-02-09
Hasan, Mohammed (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S270000, C359S273000, C359S274000
Reexamination Certificate
active
07660029
ABSTRACT:
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 WO3inverse opals.
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Ashrit Pandurang
Kuai Sulan
Derenyi Eugene F.
Hasan Mohammed
Stikeman & Elliott LLP
Universite de Moncton
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