Through interference of surface plasmon polaritons (SPPs), near-field radiation transfer between pillar-array-structured surfaces was enhanced compared with that between plane surfaces. Even in nanoscale channels between the pillars, the SPPs could propagate, and then a kind of interference and resonance took place according to the depth of the channel between the pillars. With decreasing pillar height, the frequency at maximum radiation transfer was shifted to the high-frequency side. That is, spectral control of near-field radiation could be achieved using pillar-array-structured surfaces.

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