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High-Temperature Polaritons in Ceramic Nanotube Antennas
Ryan Starko-Bowes1, Xueji Wang2, Zhujing Xu2
1University of Alberta , Edmonton , Alberta T6G 2R3 , Canada.
Nano Letters
|October 5, 2019
Summary
Boron nitride nanotubes act as high-temperature thermal nanoantennas. These materials efficiently emit mid-infrared light by coupling dark polaritons to radiative modes, enabling new heat transfer applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- High-temperature photonics requires materials stable in extreme environments.
- Ceramics supporting polaritons offer new ways to engineer radiative heat transfer.
- Hexagonal boron nitride (hBN) has low-loss polaritons in the mid-infrared.
Purpose of the Study:
- To investigate boron nitride nanotubes (BNNTs) as high-temperature thermal emitters.
- To leverage BNNTs' optical phonons for mid-infrared thermal antenna applications.
- To confirm radiative polaritonic modes and antenna behavior in BNNTs at high temperatures.
Main Methods:
- Utilizing optical phonons in BNNTs to create mid-infrared thermal antenna emitters.
- Direct measurement of thermal emission from a disordered BNNT system.
- Analyzing the coupling of dark polaritons to radiative modes in BNNTs.
Main Results:
- Demonstrated strong mid-infrared thermal antenna emitters using BNNTs at 938 K.
- Confirmed radiative polaritonic modes in a disordered BNNT system.
- Observed antenna behavior in BNNTs, even in disordered arrangements.
Conclusions:
- BNNTs can function as high-frequency optical phonon polaritons.
- These BNNTs act as effective mid-infrared thermal nanoantenna sources at high temperatures.
- The findings open avenues for advanced thermal management and optical devices.
