Grating waveguide structure for reinforcing an excitation field and use thereof
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Abstract
The invention relates to a variable embodiment of a grating waveguide structure, based on a planar thin-film waveguide with a first optically transparent layer (a) on a second optically transparent layer (b) having a lower refractive index than layer (a), and a grating structure (c) modulated in layer (a), wherein the intensity of an excitation light irradiated at the resonance angle for incoupling into layer (a) is enhanced by at least a factor of 100 on layer (a) and within layer (a), at least in the region of the grating structure (c), in comparison with the intensity of said excitation light on a substrate surface without incoupling of the excitation light. The invention also relates to an optical system with an excitation light source and an embodiment of a grating waveguide structure according to the invention, and to a method for enhancing an excitation light intensity, and to the use thereof in bioanalytical detection processes, in non-linear optics or in telecommunications or communications industry.
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Citations
112 Claims
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1-60. -60. (canceled)
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61. A method for amplification of an excitation light intensity, using a grating wave guide structure comprising a layer (a), transparent at least at one excitation wavelength, on a second layer (b) with lower refractive index than layer (a), also transparent at least at said excitation wavelength, and at least one grating structure (c) modulated in layer (a), wherein:
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a. the refractive index of the first optically transparent layer (a) is larger than 1.8, b. grating structures (c) modulated in layer (a) have a period of 200 nm-1000 nm and a modulation depth of 3 nm to 100 nm, c. layer thickness of the optically transparent layer (a) allows guiding of one to three modes at a given wavelength wherein the intensity of an excitation light irradiated at the resonance angle for incoupling into layer (a) on a grating structure (c) modulated in layer (a) of a grating waveguide structure, is enhanced by at least a factor of 100 on layer (a) and within layer (a), at least in the region of the grating structure (c), in comparison with the intensity of said excitation light on a substrate surface without incoupling of the excitation light and wherein luminescence label or biomolecules capable of luminescence are excited by two-photon absorption. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96)
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75. A method for the detection of one or more analytes by luminescence detection, in one or more samples on one or more measurement areas of a grating waveguide structure comprising a layer (a), transparent at least at one excitation wavelength, on a second layer (b) with lower refractive index than layer (a), also transparent at least at said excitation wavelength and at least one grating structure (c) modulated in layer (a), wherein:
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d. the refractive index of the first optically transparent layer (a) is larger than 1.8, e. grating structures (c) modulated in layer (a) have a period of 200 nm-1000 nm and a modulation depth of 3 nm to 100 nm, f. layer thickness of the optically transparent layer (a) allows guiding of one to three modes at a given wavelength for the determination of one or more luminescences from a measurement area or from an array of at least two or more laterally separated measurement areas (d) or of at least two or more laterally separated segments comprising several measurement areas on said grating waveguide structure, wherein the intensity of an excitation light irradiated at the resonance angle for incoupling into layer (a) is enhanced by at least a factor of 100 on layer (a) and within layer (a), at least in the region of the grating structure (c), in comparison with the intensity of said excitation light on a substrate surface without incoupling of the excitation light and wherein luminescence label or biomolecules capable of luminescence are excited by two-photon absorption. - View Dependent Claims (76, 77, 78, 79, 80, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
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Specification