All-optical modulation in crystalline organic semiconductor waveguides
First Claim
1. An improved method of modulating light in at least one waveguide, comprising:
- (a) providing said at least one waveguide;
(b) introducing light from a first source into said waveguide;
(c) introducing light from a second source at an angle to said waveguide to cause modulation of said light from said first source,wherein the improvement comprises fabricating said waveguide from a crystalline organic aromatic semiconductor compound having a resonant non-linear coefficient of at least 10-6 cm-2 /W at room temperature and grown in a quasi-epitaxial structure.
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Abstract
All-optical modulation occurs in crystalline organic semiconductor waveguides (10a) grown by the ultrahigh vacuum process of organic molecular-beam deposition onto substrates (10b). Two light beams with wavelengths of 1.06 and 0.514 μm from a first source (12) and a second source (34), respectively, may be used as the guided and the pump light sources, respectively. A resonant non-linear coefficient at room temperature of 5.4×10-5 cm2 /W at 1.06 μoccurs at a pump intensity of 1.0 W/cm2. This large non-linear effect is attributed to free electron-hole pairs produced by the dissociation of excitons generated by the short wavelength beam. A carrier lifetime of (17±1) us, which determines the modulator switching time, is in good agreement with theoretical predictions. This appears to be the first observation of free-carrier-induced index modulation in crystalline organic waveguides.
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Citations
17 Claims
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1. An improved method of modulating light in at least one waveguide, comprising:
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(a) providing said at least one waveguide; (b) introducing light from a first source into said waveguide; (c) introducing light from a second source at an angle to said waveguide to cause modulation of said light from said first source, wherein the improvement comprises fabricating said waveguide from a crystalline organic aromatic semiconductor compound having a resonant non-linear coefficient of at least 10-6 cm-2 /W at room temperature and grown in a quasi-epitaxial structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An improved method of modulating light in at least one waveguide, comprising:
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(a) providing said at least one waveguide; (b) introducing light from a first source into said waveguide; (c) introducing light from a second source at an angle to said waveguide to cause modulation of said light from said first source, wherein the improvement comprises fabricating said waveguide from a planar stacking crystalline organic aromatic semiconductor compound having a resonant non-linear coefficient of at least 10-5 cm2 /W at room temperature and grown in a quasi-epitaxial structure. - View Dependent Claims (14, 15, 16, 17)
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Specification