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Recent experimental studies on near-field thermophotovoltaic (TPV) energyconversion have mainly focused on enhancing performance via photon tunneling ofevanescent waves. In the sub-micron gap, however, there exist peculiarphenomena caused by the interference of propagating waves, which is seldomobserved due to the dramatic increase of the radiation by evanescent waves infull spectrum range. Here, we experimentally demonstrate the oscillatory natureof near-field TPV energy conversion in the far-to-near-field transition regime(250-2600 nm), where evanescent and propagating modes are comparable due to theselective spectral response by the PV cell. Noticeably, it was possible toproduce the same amount of photocurrent at different vacuum gaps of 870 and 322nm, which is 10\% larger than the far-field value. Considering the greatchallenges in maintaining nanoscale vacuum gap in practical devices, this studysuggests an alternative approach to the design of a TPV system that willoutperform conventional far-field counterparts.

Thermophotovoltaic energy conversion in far-to-near-field transition regime