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We exploit optical resonance in an ultra-thin (6 to 31 nm) undoped amorphous silicon/organic hybrid photovoltaic (PV) structures that can produce semi-transparent transmissive colors insensitive to incidence angle of up to ±70° regardless of polarization.
Here we show a perfect absorption ground plane cloak that works at entire visible frequency. Such homogeneous perfect absorption carpet is made of low density carbon nanotube (CNT) "forest", and invisibility has been observed by naked eyes for unpolarized light at entire visible frequency with cloaking area 100 times larger than a wavelength.
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