3. Different types of sources
To control the emission properties of a thermal source, an optical resonant mode and a light-absorbing material are required. In most examples in the literature, the absorbing material is a metal or a crystal that is polar on its band and contains the optical phonon, or a highly doped semiconductor.
The main types of optical resonance in nanostructures are presented in Box 1 (§ 2.1.2
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Different types of sources
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