Optical devices comprising polymer-dispersed crystalline materia

Details Optical devices comprising polymer-dispersed crystalline materia Optical devices comprising polymer-dispersed crystalline materia

1997-11-21

1999-12-21

Moskowitz, Nelson

Optical: systems and elements

Optical modulator

Having particular chemical composition or structure

359248, 359298, 359320, G02F 135, G02B 690, C09K 1912

Patent

active

060057076

ABSTRACT:
Optical modulators and switches for use in telecommunications systems are disclosed having solid-state crystalline optical material comprised of III-V, II-VI, and IV semiconductor nanocrystals embedded in a polymer matrix. In a preferred embodiment, the crystalline material comprises CdSe crystals sized at less than 5.8 nm in diameter and more preferably at less than about 4 nm in diameter and advantageously embedded in poly(vinyl pyridine). The crystalline material sandwiched between two electrodes defines an optical modulator. In one preferred embodiment, the crystalline material with ten-percent crystal embedded in a polymer will exhibit with an applied voltage of 100V, a differential absorbance spectra (.DELTA.A) of about 50 cm.sup.-1 at wavelengths of about 610 nm and a differential refractive index (.DELTA.n) of about 10.sup.-4 at wavelengths of about 625 nm.

REFERENCES:
Akinow et al, Optika in Spekt. vol. 72, #4, pp. 1026-1032, abst. only herewith, Apr. 1992.
Bawendi et al, Physical Review Letters, vol. 65, #13, pp. 162-1626; abst. only herewith, Sep. 24, 1990.
Woggon U et al. "Electro-Optic Properties of CdS Embedded in a Polymer", Physical Review B (Condensed Matter), Oct. 15, 1993, USA, vol. 48, No. 16, pp. 11979-11986.
Salata O V et al. "Uniform GaAs Quatnum dots in a Polymer Matrix", Applied Physics Letters, Jul. 11, 1994, USA, vol. 65, No. 2, pp. 189-191.

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