Compositions – Light transmission modifying compositions – Infrared
Patent
1994-07-12
1995-08-29
Tucker, Philip
Compositions
Light transmission modifying compositions
Infrared
252582, 385141, 385143, F21V 904
Patent
active
054457670
ABSTRACT:
##STR1## The specification identifies dithiolenes which give good performance as the critical region of an optical switch. The dithiolenes have the formula shown in FIG. 1 wherein: (A) the R groups, any two of which may be the same or different, are selected so as to tune the absorption bands of the molecule for use at the operational wavelength and/or to act as bridges to join molecules together: (B) the X groups, any two of which may be the same or different, are selected from S and Se: (C) M is selected from Ni, Pt, Pd and Cu: (D) C=-1 or 0: and (E) (i) when C=-1, Y is a cation to render the molecule electrically neutral: preferably Y is selected from ammonium, substituted ammonium, Na.sup.+, Li.sup.+ and K.sup.+, (ii) when C=0, Y is absent (since the molecule is neutral there is no change to balance). The dithiolene may be diluted with an organic polymer selected from polyacrylates, polymethacrylates, such as polymethymethacrylate, polycarbonates, polyisobutylene, polyethylene terephthalate, polystyrene and polysiloxane.
REFERENCES:
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patent: 3878478 (1975-04-01), Drexhage
patent: 4992244 (1991-02-01), Grate
IEEE Journal of Quantam Electronics, vol. 18, No. 10, Oct. 1982, IEEE, S. M. Jensen: "The Nonlinear Coherent Coupler", pp. 1580-1583, see the whole document.
Proceedings of the S.P.I.E., vol. 971, Aug. 1988, (San Diego), J. F. Nicoud: "New Materials for Second Harmonic Generation: Tentative Control of Non-Centrosymmetry in Organic Crystals", pp. 2-9, see Chapter 2.3 organometallics.
Hill Callum A. S.
Oliver Stephen N.
Rush James D.
Underhill Allan E.
Winter Christoper S.
British Telecommunications public limited company
Tucker Philip
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