Figure 1
(a) Principle of on-chip cloaking. Directional light through a mask of “Ψ” is incident onto the window where thousands of waveguides embedded in the chip, propagating along the waveguides to circumvent the inner structure “ħ” and re-assembling to restore the mask image “Ψ” without interference of “ħ”. (b–d) Characterization of cloaking structures with different pitches: (b) Cross sections of cloaking windows under the microscope with scale bars and duty cycles. Output images of the cloaking structures with (d)/without (c) the inner structure with pitches varying from 13 μm to 31 μm.
