Phoxonic crystals—a new platform for chemical and biochemical sensors
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A new sensor platform is based on so-called phoxonic crystals. Phoxonic crystals are structures designed for simultaneous control of photon and phonon propagation and interaction. They are characterized by a periodic spatial modulation of the dielectric constant as well as elastic properties on a common wavelength scale. Multiple scattering of photons and phonons results in a band gap where propagation of both waves is prohibited. The existence of photonic and phononic band gaps opens up opportunities for novel devices and functional materials. The usage of defect modes is an advantageous concept for measurement. The defect also acts as point of measurement. We show theoretically that the properties of the defect mode can be tailored to provide very high sensitivity to optical and acoustic properties of matter confined within a defect cavity or surrounding the defect or being adsorbed at the cavity surface. In this paper, we introduce the sensor platform and analyze the key features of the sensor transduction scheme. Experimental investigations using a macroscopic device support the theoretical findings.
KeywordsPhoxonic crystals Resonant sensor Refractive index Speed of sound
This work has been performed as part of Future and Emerging Technologies–Open project, Tailphox, supported by the European Community under grant 233883. We explicitly acknowledge the support of Alejandro Martinez from Universidad Politecnica de Valencia as well as Yan Pennec and Bahram Djafari-Rouhani, Université de Lille 1. Further support by the German Research Foundation under grant LU 605–12 is gratefully acknowledged. The authors specifically want to thank Abbas Omar, Otto-von-Guericke-University Magdeburg, who gave us access to the microwave laboratory and supported the work with helpful discussions. We also wish to thank Rainer Schulze Höing, Mauritz GmbH + Co.KG, for providing the microwave sample and Santer zur Horst-Meyer, Sonotec GmbH, and Gerhard Mook, Otto-von-Guericke-University, Magdeburg, for providing specific low-frequency ultrasonic transducers.
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