Figure 35.

Scheme of a local-field dielectric transducer made of silicon. Diamond-like carbon (DLC) layer with equally spaced FePt grains is placed above NiTa substrate. FePt grains of size $14$nm are arranged in the square lattice with the period of $20$nm. The other parameters and informations can be obtained in Ref. [189]. Optical properties of FePt alloy and silicon were obtained from [232] and [233], respectively. The permittivity of NiTa alloy is calculated as the arithmetic mean of Ni and Ta permittivities. DLC permittivity is around ${\epsilon }_{\mathrm{DLC}}=3.5$ coming from [234,235], reprinted figure with permission from [189]. Copyright (2017) by the American Physical Society.