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25 April 2012 Phoxonic crystal sensor
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The concept of photonic and phononic crystal sensors is based on the measurement of changes in the transmission properties of the devices caused by changes of material properties of one of the materials building the crystal. It has been demonstrated that in the optical case the key parameter is the refractive index, i.e. speed of light, in the acoustic case it is sound velocity. Both parameters can be measured with accuracy competitive with other optical and acoustic sensor principles. A phoxonic crystal sensor combines both concepts in one device, therefore allowing for a dual parallel determination of two independent material properties. Such a sensor is especially attractive for complex analytes as common in chemistry and biochemistry. We have designed and modeled a phoxonic crystal consisting of a solid matrix and holes where the central cavity acts as analyte container. We especially concentrate on the generation of a characteristic feature within the transmission spectrum like a transmission peak within the phoxonic band gap where the respective wavelength or frequency of maximum transmission is sensitive to material properties of the analyte. We could show theoretically that a (geometric) defect is required in photonics whereas in phononics separation of the sensitive peak is the challenge. The respective wavelength/frequency of maximum transmission moves in accordance to the resonance conditions. We further analyze the transmission of light and sound through a phoxonic crystal plate at normal incidence.
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Ralf Lucklum, Yan Pennec, Antoine Kraych, Mikhail Zubtsov, and Bahram Djafari-Rouhani "Phoxonic crystal sensor", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84250N (25 April 2012);


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