Abstract:
The present invention relates to a device (1) for measuring an optical absorption property of a fluid as function of wavelength. The device comprises a broadband light source (2) for emitting light, a plurality of integrated optical waveguides (3) for guiding this light, and a light coupler (10) for coupling the emitted light into the integrated optical waveguides (3) such that the light coupled into each integrated optical waveguide (3) has substantially the same spectral distribution. The device also comprises a microfluidic channel (5) for containing the fluid, arranged such as to allow an interaction of the light propagating through each waveguide (3) with the fluid in the microfluidic channel (5). Each integrated optical waveguide (3) comprises an optical resonator (15) for filtering the light guided by the waveguide (3) according to a predetermined spectral component. The spectral component corresponding to each waveguide (3) is substantially different from the spectral component corresponding to another of the waveguides (3).
Abstract:
In one aspect, a photonic device includes a substrate layer comprising magnesium fluoride and an optical guiding layer disposed on the substrate layer. The optical guide layer includes silicon dioxide. The substrate layer and the optical guide layer are transparent at an ultraviolet and visible wavelength range. In another aspect, a method includes oxidizing silicon to form a silicon dioxide layer, bonding the silicon dioxide layer to magnesium fluoride, removing the silicon and performing lithography and etching of the silicon dioxide to form a photonic device.
Abstract:
A spectrometer (10) for analyzing a sample of material (22) utilizing a broad band source of electromagnetic radiation (28) and a detector (36). The spectrometer (10) employs a waveguide (12) possessing an entry (14) and an exit (16) for the electromagnetic radiation emanating from the source (28). The waveguide (12) further includes a surface (20) between the entry and exit portions which permits interaction between the electromagnetic radiation passing through the waveguide (12) and a sample material (22). A tapered portion (24) forms a part of the entry (14) of the waveguide and couples the electromagnetic radiation emanating from the source (28) to the waveguide (12). The electromagnetic radiation passing from the exit (16) of the waveguide is captured and directed to a detector (36) for analysis.
Abstract:
A guided optical wave chemical sensor system (10) is adapted to measure the concentration of a chemical species in the presence of thin film surface contaminants on the waveguide (17). The system (10) has a light source (11) which launches two different optical waves into the waveguide (17) to establish evanescent fields (24, 25) of different penetration depths. The detector (15), which includes a data store and an arithmetic unit, is pre-calibrated using a known concentration of the chemical species and the same two different optical waves but prior to the waveguide (17) having been exposed to surface contaminants. When surface contamination is present the detector (15) evaluates the thickness of the contaminant layer from the pre-calibration data and hence evaluates the (unknown) concentration of the chemical species according to a predetermined algorithm.
Abstract:
The present invention relates to a detection device for detecting target substances in samples. The device comprises a substrate (1) with at least one planar waveguide laser (2) in or on said substrate (1), said waveguide laser (2) having a gain medium (5) for up-conversion or for down-conversion. A top layer (3) of said waveguide laser (2) forms at least part of a surface of said substrate (1) and allows formation of an evanescent wave in a sample contacting said surface. A structure is applied on said top layer (3) to define an array of probe regions (4) on said top layer (3), said probe regions (4) consisting of a coating of probe materials for sensing said target substances to be detected. The present detection device allows a parallel detection of target substances with a highly integrated design.
Abstract:
The present disclosure concerns a method and apparatus for measuring a sensor (10) comprising multiple optical resonators (11,12) optically connected to a single optical output interface (16). The optical resonators (11,12) are interrogated with a light input signal (Si). A light output signal (So) is measured from the optical output interface (16) to determine a combined spectral response (Sa) covering a wavelength range (W) including a plurality of resonance peaks (»1,i; »2,j) for each of the optical resonators (11,12). A Fourier transform spectrum (FT) of the combined spectral response (Sa) is calculated and a harmonic series of periodic peaks (n·f1) is identified in the Fourier transform spectrum (FT). The harmonic series of periodic peaks is filtered to obtain a filtered Fourier transform spectrum (FT1) and a sensor signal is calculated (X1) based on the filtered Fourier transform spectrum (FT1).
Abstract:
The invention relates to a micro-optical element (10) comprising a resonator substrate (11) onto which at least one microresonator (12) is attached, said microresonator being designed in the form of a rotationally symmetrical body (14). The at least one microresonator (12) is surrounded by a light-reflective mirror (20). The invention further relates to a micro-optical array (40) comprising at least one resonator substrate (11) onto which at least two array elements are attached, each array element having at least one microresonator (12, 12...') that is surrounded by a light-reflective mirror (20, 20'...). The invention finally relates to an optical sensor system (80) that has at least one micro-optical element (10) or at least one micro-optical array (40). An integrated portable device for a robust and highly sensitive detection of very small molecular quantities is provided using the optical sensor system (80).