Highly Flexible and Voltage Based Wavelength Tunable Biosensor

Abstract

A plasmonic absorber as a biosensor based on the highly flexible electro‐optic material is numerically investigated. The structure demonstrates multispectral high absorption in visible and unity absorption in the near‐infrared range. The resonant wavelengths are extremely sensitive to the applied voltage, variation in geometric parameters, and the refractive index of the background material, resulting in wavelength‐tunable absorption that can be used for tunable sensors and filters. The refractive index based sensitivity is calculated on different voltages to adjust the resonances to the desired point in a wide waveband for detecting a large number of different biomaterials. The electro‐optic tunability can be used to reduce fabrication errors and use of scaling. In addition, strong field absorption, broad resonant peaks, and wide incident angle absorption versatility are found in the proposed structure which can be applied for energy harvesting, infra‐red detection, and surface‐enhanced Raman spectroscopy purposes.