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.

Abstract: A method for the ultrasensitive simultaneous measurement of nonlinear optical emission signals in one or two local dimensions wherein excitation light is irradiated in modulated form from at least one light source into an interactive space in which one or several emissions that are nonlinearly correlated with the excitement light can be excited. The light emanating from the interactive spaces is measured using a one or two-dimensional detector array. Measured data is then transmitted to a computer and formatted in a one or two-dimensional data matrix. Further, non-correlated portions of the light emanating from the interactive spaces that are linearly proportionate to the intensity of the excitement light available in the interactive spaces are separated from portions of the light emanating from the interactive spaces which are not linearly proportionate. The invention also relates to an analytical system for carrying out this method.

Abstract: The invention relates to a method for the ultrasensitive simultaneous measurement of nonlinear optical emission signals in one or two local dimensions. Said method comprises the following steps: the excitation light is irradiated in a power-modulated or pulse-modulated form from at least one light source into an interactive volume or onto an interactive area or layer (hereafter called interactive spaces) in which one or several emissions that are nonlinearly correlated with the excitement light can be excited; the light emanating from said interactive spaces is measured by means of a one-dimensional or two-dimensional detector array; the measured data is transmitted from said detector array to a computer, and said data is formatted in a one-dimensional or two-dimensional data matrix.

Abstract: The invention relates to a sensor or a microphone having such a sensor. The object of the present invention is to improve the degree of development of the sensor or an optical microphone as an air-borne sound sensor. A sensor consisting of a diaphragm, wherein at least on one side the diaphragm comprises a surface which reflects a light beam, wherein on this side a first optical waveguide is constructed as a transmitting waveguide, through which a light beam passes and strikes against the diaphragm, wherein a second optical waveguide constructed at a specific angular relationship to the first optical waveguide is provided, which has the function of a receiving waveguide and into which light reflected from the diaphragm enters, an optical element is constructed in the light path between the transmitting waveguide and the receiving waveguide, by which the light beam is bunched or focussed.

Abstract: A method exites and determines a luminescence in an analyte sample which is located in contact with the waveguiding layer of an optical layer waveguide. The luminescence is generated by non-evanescent excitation in the volume of the analyte sample. Luminescence radiation generated in the immediate proximity of the surface of the waveguiding layer is conducted to a measuring device and determined after penetrating the waveguiding layer.

Abstract: The invention relates to a variable embodiment of an optical structure, comprising an optical waveguide with a waveguiding layer (a), being optically transparent at least at an excitation wavelength, wherein the intensity of an excitation light in-coupled into layer (a) and guided in layer (a) is high enough within layer (a) and on layer (a), that molecules located on the surface of layer (a) or within a distance of less than 200 nm, which are capable of luminescence and/or photo-reactive, can be excited by multi-photon excitation, preferably by two-photon excitation. Thereby, embodiments are preferred which allow for a multi-photon excitation along macroscopic distances or on extended surfaces, along the trace of the excitation light guided in layer (a).

Abstract: Composition which form hydrogen bridges are suitable for the preparation of materials of non-linear optical properties.