Thermochromic optical filter in which transition wavelength...

Details Thermochromic optical filter in which transition wavelength... Thermochromic optical filter in which transition wavelength...

2011-07-12

2011-07-12

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S239000

Reexamination Certificate

active

07977621

ABSTRACT:
A thermochromic optical filter incorporating quantum confinement devices is formed as multilayered composite film of semiconducting materials. A quantum well adjacent a barrier layer ensures proper confinement of charge carriers within the well. A transition wavelength (i.e., the energy/wavelength at which the filter becomes transparent) is established by selecting a quantum well material with a bandgap near the desired energy and a barrier layer material with a higher bandgap. For a given reference temperature (e.g., room temperature), the exact transition wavelength is fixed by the thickness of the quantum well. The quantum confinement energy is added to the bandgap energy to yield the transition energy. A thermal control system varies the temperature of the thermochromic filter to adjust the transition wavelength. Temperature changes affect both the bandgap and the quantum confinement energy, and thus the optical properties of the thermochromic filter. The thermochromic filter may function as a longpass filter.

REFERENCES:
patent: 5013918 (1991-05-01), Choi
patent: 5274246 (1993-12-01), Hopkins et al.
patent: 5347140 (1994-09-01), Hirai et al.
patent: 5530263 (1996-06-01), DiVincenzo
patent: 5585640 (1996-12-01), Huston et al.
patent: 5757828 (1998-05-01), Ouchi
patent: 5763307 (1998-06-01), Wang et al.
patent: 5881200 (1999-03-01), Burt
patent: 5889288 (1999-03-01), Futatsugi
patent: 5937295 (1999-08-01), Chen et al.
patent: 6040859 (2000-03-01), Takahashi
patent: 6240114 (2001-05-01), Anselm et al.
patent: 6281519 (2001-08-01), Sugiyama et al.
patent: 6294794 (2001-09-01), Yoshimura et al.
patent: 6304784 (2001-10-01), Allee et al.
patent: 6320220 (2001-11-01), Watanabe et al.
patent: 6329668 (2001-12-01), Razeghi
patent: 6333516 (2001-12-01), Katoh et al.
patent: 6437361 (2002-08-01), Matsuda
patent: 6498354 (2002-12-01), Jefferson et al.
patent: 6512242 (2003-01-01), Fan et al.
patent: 6600169 (2003-07-01), Stintz et al.
patent: 6611640 (2003-08-01), LoCasclo et al.
patent: 6635898 (2003-10-01), Williams et al.
patent: 6661022 (2003-12-01), Morie et al.
patent: 6753273 (2004-06-01), Holonyak, Jr. et al.
patent: 6770916 (2004-08-01), Ohshima
patent: 6777718 (2004-08-01), Takagi
patent: 6816525 (2004-11-01), Stintz et al.
patent: 6946697 (2005-09-01), Pietambaram et al.
patent: 6978070 (2005-12-01), McCarthy et al.
patent: 7026641 (2006-04-01), Mohseni et al.
patent: 7276432 (2007-10-01), Snyder et al.
patent: 7470925 (2008-12-01), Tamura et al.
patent: 2002/0080842 (2002-06-01), An et al.
patent: 2002/0152191 (2002-10-01), Hollenberg et al.
patent: 2003/0066998 (2003-04-01), Lee
patent: 2003/0107927 (2003-06-01), Yerushami et al.
patent: 2005/0157996 (2005-07-01), McCarthy et al.
patent: 2006/0011904 (2006-01-01), Snyder et al.
patent: 2006/0049394 (2006-03-01), Snyder et al.
patent: 2006/0151775 (2006-07-01), Hollenberg et al.
patent: 0851506 (1999-06-01), None
patent: 2261989 (1991-11-01), None
patent: 2003-248204 (2003-09-01), None
patent: 10-2002-0013986 (2002-02-01), None
patent: WO/98/53504 (1998-11-01), None
patent: WO 2008/106596 (2008-09-01), None
Black, C.T., et al., “Integration of self-assembled diblock copolymers for semiconductor capacitor fabrication”, Applied Physics Letters, vol. 79, No. 3 (Jul. 16, 2001), pp. 409-411, (American Inst. of Physics, NY).
Goldhaber-Gordon, D., et al., “Overview of Nanoelectronic Devices”, Proceedings of the IEEE, 85(4):521-533, Apr. 1997.
Kastner, Marc A., “Artificial Atoms”, Physics Today, Jan. 1993.
Kouwenhoven, Leo et al., “Quantum Dots”, Physics World, Jun. 1988, pp. 35-39.
Leatherdale, C.A., et al., “Photoconductivity in CdSe Quantum Dot Solids”, Phys. Review B, 62(4):2669-2680, Jul. 15, 2000.
Mccarthy, Wil, “Once Upon a Matter Crushed”, Science Fiction Age, Jul. 1999.
Mccarthy, Wil, “The Collapsium”, Del Rey Books, Aug. 2000 and Orion Books, Oct. 2000.
Mccarthy, Wil, “Programmable Matter”, Nature, 407:127, Oct. 5, 2000.
Orlov, Alexei O., et al., Clocked Quantum-Dot Cellular Automata Devices: Experimental Studies, IEEE-NANO 2001, Oct. 30, 2001, pp. 425-430.
Ryu, Du Yeol et al., “A generalized approach to the modification of solid surfaces”, Science, vol. 308 (Apr. 8, 2005), pp. 236-239.
Soh, Hyongsok T., et al., “Scanning proble lithography”, ch. 3, pp. 40-66 (2001) (Kluwer Academic Publishers, Norwell MA).
Turton, Richard, “The Quantum Dot”, Oxford University Press, 1995.
Xu, Ting et al., “The influence of molecular weight on nanoporous polymer films”, Polymer, 42 (Apr. 2001), pp. 9091-9095 (Elsevier Science Ltd.).

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