FIG 2 (IMAGE)
Caption
Figure 2. Effect of substrate on near-field radiative heat transfer (NFRHT): (a) Schematic of NFRHT between two heterostructure systems composed of α-MoO3 slab with a thickness of t and practical substrates: SiC and Au. The vacuum gap width is d. The top structure is the emitter with a high temperature T1 (300 K) and the structure below the vacuum gap is receiver with a low temperature T2 (299 K). (b) The RHF (left) and relative enhancement coefficient η (right) for three kinds of structures as functions of vacuum gap width, d at thickness of α-MoO3 slab t =20 nm. The structures studied include (I) the individual α-MoO3 slab, (II) heterostructure consisting of α-MoO3 and SiC, and (III) heterostructure consisting of α-MoO3 and Au. According to the relative enhancement coefficient of SiCsubstrate, the whole region is divided into three parts: Region I (η ≈ 1); Region II annihilation (η < 1); Region III enhancement (η > 1).
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