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The functionality of a traditional photonic device is usually realized by reshaping the wavefront of the light that relies on gradual phase changes along the optical paths, which are accomplished by either controlling the surface topography or varying the spatial profile of the refractive index. The thickness of photonic devices usually remains comparable to the wavelength of the light. However, further...
Spatial overlap between the electromagnetic fields and the analytes is a key factor for strong light-matter interaction leading to high sensitivity for label-free optical biosensors. Usually, the exponential fields of cavity modes or surface plasmon resonances are applied to monitor the refractive index variation from bio-reactions. The sensitivity is therefore limited by the influence of local index...
Optical techniques provide noncontact measurement of thickness and refractive index. These properties have a number of applications in semiconductors, dielectrics, polymers and material science. Simultaneous measurement of thickness and refractive index using various interferometric and other optical techniques have been reported by a number of authors. These techniques utilize visible or IR radiations...
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