Gain-enhanced plasmon metal nanoslit sensor

We have designed and investigated a double-band gain-assisted nanoslit array for the sensor applications. We find that the height, width and period of nanoslit array are the main factors for determining (he sensor's performances. Due to the intrinsic Ohmic loss of system, the sensing efficiency has been hindered seriously. By implanting the gain medium into the designed structure, the sensing performance can be enhanced greatly due to a dramatic amplification of the EOT resonance by the energy transfer from the gain medium. Serving as gain-assisted refractive index senor, the corresponding FOM can reach to 440 with a gain value of corresponding threshold. It has a big potential in biomedical and sensing applications.