Towards accurate LSPR biosensors based on the projection method: A direct measurement for refractive index

We present a simple and accurate method to improve both accuracy and precision for localized surface plasmon resonance biosensors based on gold nanotube structures. The finite difference time domain (FDTD) method and the nanoimprint lithography technique were used in simulating and fabricating the nanotubes, respectively. The method provides a direct measure for the refractive index and achieves an increased accuracy as compared to other established methods.