Audhkhasi Romil, Povinelli Michelle L
Opt Lett. 2021 Apr 1;46(7):1768-1771. doi: 10.1364/OL.414705.
We propose gold-vanadium dioxide microstructures for which the difference in thermally radiated power between the low and high temperature states can be tuned via structural design. We start by incorporating in a gold-dielectric-gold waveguide to achieve a temperature-dependent mode effective index. We show that a cavity formed in this waveguide structure has a fundamental resonance wavelength that shifts with temperature. We calculate the thermal radiated power from the cavity at temperatures above and below the phase transition of for wavelengths between 8 and 14 µm. We show that the difference in radiated power can be made positive, negative, or zero simply by adjusting the cavity length. Finally, we use our cavity to design thermally emissive metasurfaces with spatial emission patterns that can be inverted with temperature. Our emitters could serve as building blocks in the realization of metasurfaces enabling complex thermal radiation control.
我们提出了一种金-二氧化钒微结构，通过结构设计可以调节其低温和高温状态之间的热辐射功率差异。我们首先将其纳入金-电介质-金波导中，以实现与温度相关的模式有效折射率。我们表明，在这种波导结构中形成的腔具有随温度变化的基模共振波长。我们计算了在二氧化钒相变温度以上和以下，波长在8至14微米之间时，腔内的热辐射功率。我们表明，只需调整腔的长度，辐射功率的差异就可以为正、为负或为零。最后，我们利用我们的腔设计了具有可随温度反转的空间发射模式的热发射超表面。我们的发射器可以作为实现能够进行复杂热辐射控制的超表面的构建模块。
