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(Color online) (a) Optical micrograph under white light of a graphene bubble deposited on silicon. The Newton rings are well visible; (b)optical micrograph under monochromatic light of a graphene bubble deposited on silicon: the Newton rings appear as a series of bright and dark fringes. Inset: intensity profile; (c), (d) AFM topography scan of triangular and square bubbles on BN substrate; (e) 3 μm × 3 μm topography AFM scan of a bubble; (f) schematic diagram of the substrate and cross-section of the bubble, obtained by AFM. Squares––experimental data, the full line is the fit of the cross-section by assuming spherical shape.
(Color online) (a) Intensity profile of the Newton rings across the width of the bubble for different gate voltages. Maxima and minima correspond to bright and dark fringes, respectively. (b) Radii of bright and dark Newton rings as a function of gate voltage. The radius of the rings is clearly decreasing for negative Vg.
(Color online) Reconstructed shape of the bubble for Vg = 0, −15, −25, −35 V. The application of a gate voltage results in a change in the bubble’s shape.
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