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Using a pair of p- and n-type semiconductors separated by a nanoscale vacuumgap, we introduce an optoelectronics element prototype, "photonic p-njunction", as an analogue of the electronic p-n junction, which is demonstratedto serve as an ideal near-field heat flux modulator. The high modulationperformance relies on the switch among three fundamental photon-carrierinteraction modes (i.e., surface plasmon polaritons, symmetric depletedinternal plasmon polaritons and symmetric accumulated surface plasmonpolaritons) caused by the changes in hole and electron densities near thesurfaces under a tunable bias. This prototype offers new thoughts not only forcontactless thermal management at nanoscale but also for design ofoptoelectronics devices processing information carried by plasmon polaritons.

Photonic p-n Junction: An Ideal Near-Field Heat Flux Modulator