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We demonstrate experimentally the existence of compact localized states(CLSs) in a quasi-one-dimensional photonic rhombic lattice in presence of twodistinct refractive-index gradients (i.e., a driven lattice ribbon) acting asexternal direct current (dc) electric fields. Such a lattice is composed of anarray of periodically arranged evanescently coupled waveguides, which hosts aperfect flatband that touches both remaining dispersive bands when it is notdriven. The external driving is realized by modulating the relative writingbeam intensity of adjacent waveguides. We find that a y-gradient setperpendicularly to the ribbon preserves the flatband while removing theband-touching. The undriven CLS - which occupies two lattices sites over oneunit cell - turns into a quincunx-shaped CLS spanned over two unit cells.Instead, an x-gradient acting parallel to the ribbon yields a Stark ladder ofCLS whose spatial profile is unchanged with respect to the undriven case. Wenotably find that their superposition leads to Bloch-like oscillations inmomentum space.

Observation of quincunx-shaped and dipole-like flatband states in photonic rhombic lattices without band-touching