Abstract
An optical filter, having a maximum transmission of 71% at single mode, with salient out-of-band rejection is designed with a combination of corrugated waveguide and nano-disk resonators. Plasmonic resonances of different bandwidths adjusted at different wavelengths have been achieved by varying the structural parameters (waveguide width, coupling gap, and resonator dimensions). Finally, a combined integrated structure is proposed as an optical filter for exciting multiple modes, which can extend the operating wavelength range (max. 2200 nm). The resonance wavelength and bandwidth of this filter can be adjusted further by tailoring the structural geometry, paving the way for highly efficient and compact optical devices and sensors.
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