Applications of Near-Field Thermal Radiation

Basu, Soumyadipta

doi:10.1016/b978-0-323-42994-8.00007-6

Cited by 1 publication

(2 citation statements)

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“…To elucidate such an observation, the photocurrent generation is measured as a function of the vacuum gap distance and compared with theoretical predictions based on the fluctuational electrodynamics and quantum efficiency of the PV cell (see the Methods section). Figure b clearly reveals the oscillatory nature of the photocurrent with respect to the vacuum gap distance, unlike the monotonic increase in the heat transfer in the near field. , This oscillation occurs because the PV cell utilizes photons whose energy is greater than the band-gap energy; that is, the PV cell acts as an optical short-wavelength-pass filter. Due to the coherence of thermal radiation in the far-to-near-field transition regime, our experiments demonstrate that the performance of the NF-TPV device is not always improved as the emitter closely approaches the PV cell.…”

Section: Resultsmentioning

confidence: 98%

“…The near-field radiation between the emitter and the PV cell is calculated by adding contributions of propagating and evanescent modes, as ,, where Θ(ω, T i ) = ℏω/{exp[ℏω/( k B T i )] – 1} is the mean energy of the Planck oscillator, ω is the angular frequency, ℏ is the reduced Planck constant, k B is the Boltzmann constant, and T 1 and T 2 are the temperature of the emitter and the PV cell, respectively. The exchange functions for propagating and evanescent waves are expressed by where r 01 p,s and r 02 p,s are the modified reflection coefficients for the vacuum/doped-Si/SiO 2 (or vacuum/SiO 2 ) and vacuum/Au/ n -GaSb multilayers, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Thermophotovoltaic Energy Conversion in Far-to-Near-Field Transition Regime

et al. 2022

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Recent experimental studies on near-field thermophotovoltaic energy conversion have mainly focused on improving performance via photon tunneling of evanescent waves. In the sub-micron gap, however, there exist peculiar phenomena induced by the interference of propagating waves, which are seldom observed in the full spectrum radiation due to the massive increase in evanescent modes. Here, we experimentally demonstrate the oscillatory nature of near-field thermophotovoltaic energy conversion in the far-to-near-field transition regime (250−2600 nm), where evanescent and propagating modes are comparable due to the selective spectral response by the photovoltaic cell. Noticeably, we show that the same amount of photocurrent can be generated at different vacuum gaps of 870 and 322 nm, which is 10% larger than the far-field value.

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Section: Resultsmentioning

confidence: 98%