PROJECT TITLE :

Tunable Plasmonic Sensor With Metal–Liquid Crystal–Metal Structure

ABSTRACT:

A brand new tunable plasmonic biosensor is proposed by embedding liquid crystals in the slit region of a corrugated plasmonic nanoslit array. The absorption spectrum of the structure and, therefore, the sensing wavelength can be controlled by applying voltage to the electrode parts of the device. The interaction between the waveguide mode inside the slit and also the surface plasmon polaritons on the corrugation surface will be changed using the electrooptical effect of the liquid crystals. Our numerical simulations with the finite-difference time-domain (FDTD) methodology reveal a massive tuning of the absorption spectrum up to a hundred nm. Along with the tunability feature, the structure incorporates a high sensitivity of 570 nm/RIU. The sensing performance of the device is evaluated by performing homogeneous biochemical sensing simulations. The special feature of the proposed structure offers it an chance to be used as an efficient component in integrated photonics circuits for miniaturization and tuning purposes.


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