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    • 6. 发明申请
    • WAVEGUIDE ARRANGEMENT
    • 波形安排
    • US20160187579A1
    • 2016-06-30
    • US14650711
    • 2013-11-26
    • HUMBOLDT-UNIVERSITÄT ZU BERLINFORSCHUNGSVERBUND BERLIN E.V.
    • Rico HENZEAndreas THIESOliver BENSON
    • G02B6/122G02B6/136
    • The invention relates to a waveguide arrangement (10) comprising a substrate (20) and at least one strip-shaped waveguide made of a wave-guiding layer material (30). The strip waveguide extends strip-like in a longitudinal direction and can guide waves in its longitudinal direction so that the wave propagation direction corresponds to the longitudinal direction of the strip waveguide. The refractive index of the substrate (20) is greater than the refractive index of the layer material (30). In order to guide waves vertically, the strip waveguide forms a waveguide bridge (60) which is located above a recess (100) in the substrate (20) and which is at least partially spatially separated from the substrate (20) there.
    • 本发明涉及一种波导装置(10),其包括基板(20)和由波导层材料(30)制成的至少一个条形波导。 带状波导沿纵向方向延伸成条状,并且可以在其纵向方向上引导波,使得波传播方向对应于条形波导的纵向方向。 基板(20)的折射率大于层材料(30)的折射率。 为了垂直地引导波浪,带状波导形成位于基底(20)中的凹部(100)上方并且至少部分空间上与基底(20)分离的波导桥(60)。
    • 10. 发明申请
    • PHOTOACOUSTIC METHOD WITH A MEASURING LIGHT HAVING A PREDETERMINED WAVELENGTH RANGE FOR THE DETERMINATION OF PROPERTIES OF AN INHOMOGENEOUS SAMPLE
    • US20200326274A1
    • 2020-10-15
    • US16756348
    • 2018-10-26
    • HUMBOLDT-UNIVERSITÄT ZU BERLIN
    • Raphael SCHLESINGERJan-Ferenc KISCHKATHermann VON LILIENFELD-TOAL
    • G01N21/17A61B5/145
    • The invention relates to a photoacoustic method comprising a measurement light having a predefined wavelength range for determining properties of an inhomogeneous sample, the sample having a mean absorption length μ from the range of 1 to 100 micrometers for the predefined wavelength range, the method comprising the following steps: a) radiating at least one measurement light pulse having a predefined pulse duration and a predefined intensity onto a measurement area of the area F with √F>>μ in the surface of the inhomogeneous sample; b) detecting at least one pressure transient at the measurement area, the pressure transient resulting from the absorption of the at least one measurement light pulse in the inhomogeneous sample with production of a pressure wave propagating to the measurement area; c) calculating a value for the energy density absorbed by the sample during the pulse duration from the curve of the at least one pressure transient at the start and at the end of the at least one measurement light pulse; characterized by d) repetition of steps a) to c) for different angles of incidence of the measurement light with respect to the normal of the measurement area, the energy density values determined in c) each being indicated with the angle of incidence; e) modeling the inhomogeneous sample as a stack of layers, each layer being assigned at least a layer thickness and an absorption coefficient, at least one absorption coefficient of a layer being a fitting parameter; f) performing a fitting procedure for the fitting parameters of the stack of layers, the division of the energy density values indicated with the angle of incidence into contributions of the individual layers being varied by variation of the fitting parameters until a predefined consistency criterion is met; g) reading out the fitted fitting parameters as values at least for the depth-resolved absorption coefficient of the inhomogeneous sample.