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Caption : supplementary figure 1: ideal conditions for maximizing circular dichroism in planar chiral metamaterials. completely destructive (a) and constructive interference between the unconverted scattered field, 〖r_xx e〗_x, (or 〖r_yy e〗_y) and the converted scattered field, 〖r_xy e〗_y (or 〖r_yx e〗_x), under lcp (a) and rcp (b) illumination at a wavelength of 800 nm. dashed lines represent the initial incident field vectors e_x and e_y with a 90° phase shift. solid lines represent the reflected field vectors.

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Caption : supplementary figure 2: optical response of symmetrical h-shaped nanostructure. a, schematic of a h-shaped nanostructure unit cell. dimensions are l_1=200 nm, l_2=50 nm, l_3=200 nm, w=50 nm, p_x=210 nm, p_y=290 nm, and the thickness of sio2 is 120 nm. b, absorption spectra of lcp and rcp light. insert shows the optical cd spectra. c,d, amplitude (d) and phase (d) of reflection coefficients for e_x and e_y. e,f, vector plots of reflected fields r_xx e_x and r_yy e_y under lcp (e) and rcp (f) illumination at a wavelength of 800 nm.

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Caption : supplementary figure 3: optical response of asymmetrical h-shaped nanostructure. a, schematic of a unit cell of h-shaped nanostructure. dimensions are l_1=155 nm, l_2=50 nm, l_3=135 nm, w=50 nm, p_x=210 nm, p_y=290 nm, and the thickness of sio2 is 120 nm. b, absorption spectra of lcp and rcp light. insert shows the optical cd spectra. c,d, amplitude (d) and phase (d) of reflection coefficients for e_x and e_y. e,f, interference between the uncovered scattered field, 〖r_xx e〗_x, (or 〖r_yy e〗_y) and the converted scattered field, 〖r_xy e〗_y (or 〖r_yx e〗_x), under lcp (e) and rcp (f) illumination at a wavelength of 800 nm.