“…The different profile of the grating will affect the outputs of the coupled MRRs, and consequently, will varies the spacing between the two center wavelengths in a dualwavelength. Spectral tunability of cavities is an enabling functionality for next generation integrated nanophotonic devices and circuits to include light sources and emitters [49][50][51], reconfigurable switches and modulators [52][53][54][55][56][57][58][59], surface-sensitive devices [60], and application in on-chip data communication [61,62] ideally with nanoscale footprint for high electro-optic device efficiencies [63,64]. For instance, the MRRs either can therefore be used as sensor devices based on an evanescent wave interacting with the surrounding cladding of the system made of semiconductors or be used to generate millimeter wave used in optical communications [61,62].…”