Optical: systems and elements – Optical modulator – Having particular chemical composition or structure
Reexamination Certificate
2005-02-22
2005-02-22
Ben, Loha (Department: 2873)
Optical: systems and elements
Optical modulator
Having particular chemical composition or structure
C359S237000, C359S245000, C359S279000, C359S321000, C359S332000, C359S361000, C343S786000, C343S787000, C343S909000, C365S113000, C365S163000, C369S275200, C250S214100, C257S002000
Reexamination Certificate
active
06859304
ABSTRACT:
A photonic crystal having reversibly tunable photonic properties. The photonic crystal includes a phase change material having a plurality of structural states that vary with respect to fractional crystallinity. Optical constants including refractive index, extinction coefficient and permittivity vary as the fractional crystallinity of the phase change material is varied thereby providing tunability of photonic crystal properties. Variations among the structural states of the phase change material are reversibly effected through the addition of energy in forms including optical or electrical energy. The photonic crystals may include defects that provide photonic states within the photonic band gap. The position of these states is tunable through the control of the fractional crystallinity of the phase change material included in the photonic crystal. Electromagnetic radiation resonators including photonic crystals having photonic states in the photonic band gap are further provided. These resonators may be used for frequency selective filtering or routing of electromagnetic radiation and permit tunable variation in the frequency and decay rates of resonant modes through control of the structural state of the phase change material. These resonators are further coupled to waveguides to provide tunable channel drop filters and narrowband reflectors.
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Miller Robert O.
Tsu David
Ben Loha
Bray Kevin L.
Energy Conversion Devices Inc.
Siskind Marvin S.
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