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We report an Aubrey-Andre-Harper (AAH) model based quasi-periodic losslessevanescently coupled waveguide lattice to study the unconventional physics oflight localization. We present an exclusive methodical analysis of theband-topology of a tight-binding discrete lattice and accordingly study themodal characteristics to reveal the fact that a higher value of quasi-periodicmodulation strength is imperative for observing a signature of fully localizedlight states having higher eigenenergy. This analytical concept has numericallybeen implemented in the proposed topological lattice to achieve lightlocalization, where we have shown that the supported states not only depend ontopological parameters, but also on the specific location of excitation whichis supported by the violation of bulk-edge correspondence due toquasi-periodicity. Furthermore, we have investigated a unique effect of thepresence of disorder on light localization phenomenon, where it has beenreported that the presence of off-diagonal disorder, which is otherwisedetrimental, favours light localization in the proposed structure due totopological protection. The findings indeed have the potential to open up afertile platform to manipulate light in topologically aided passive photonicdevices.

Exploring Unconventional Features Of Light Dynamics In Aubrey-Andre-Harper Model Based Quasi-periodic Optical Lattices