Diagram of the electromagnetic spectrum with indications of the wavelength, λ, and frequency, ν, of the most representative radiations from shorter and most energetic, cosmic rays, to the longer and less energetic radiofrequencies. A zoom detail of the optical part of the spectrum shows that light radiations is in the hundred nm and THz range of wavelengths and frequencies respectively.
Scheme of the operation principle of three different technologies used to harvest energy from the electromagnetic spectrum. (a) Photovoltaic technology (PV), (b) radiofrequency rectenna technology (RFR) and (c) optical rectenna technology (OR).
electromagnetic waves by r shevgaonkar pdf
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