scholarly journals Near-field thermal rectification devices using phase change periodic nanostructure

2018 ◽  
Vol 26 (2) ◽  
pp. A209 ◽  
Author(s):  
Alok Ghanekar ◽  
Yanpei Tian ◽  
Matthew Ricci ◽  
Sinong Zhang ◽  
Otto Gregory ◽  
...  
Keyword(s):  
Phase Change ◽  
Near Field ◽  
Thermal Rectification ◽  
Periodic Nanostructure

Enhanced Thermal Rectification of Near-Field Thermal Diode Using Surface Gratings

2016 ◽  
Author(s):  
Alok Ghanekar ◽  
Jun Ji ◽  
Mingdi Sun ◽  
Zongqin Zhang ◽  
Yi Zheng
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Near Field ◽  
Forward Bias ◽  
Dissimilar Materials ◽  
Temperature Dependent ◽  
Thermal Rectification ◽  
Rectification Factor ◽  
Change Material

We demonstrate workings of a near-field thermal rectification device that uses phase change material to achieve asymmetry in heat transfer. We exploit the temperature dependent dielectric properties of VO2 due metal-insulator transition near 341 K. The device operates near the critical temperature of the phase change material. Analogous to an electrical diode, heat transfer coefficient is very high in one direction (forward bias) while it is very small when the polarity of temperature gradient is reversed (reverse bias). Rectification as high as 15 can be obtained for minimal temperature difference of 5 K. We show that high rectification is achieved by using 1-D triangular and rectangular surface gratings. The rectification factor is dramatically enhanced in the near-field due to the spectral mismatch between dissimilar materials for the negative polarity.

High-rectification near-field thermal diode using phase change periodic nanostructure

2016 ◽  
Vol 109 (12) ◽  
pp. 123106 ◽  
Author(s):  
Alok Ghanekar ◽  
Jun Ji ◽  
Yi Zheng
Keyword(s):  
Phase Change ◽  
Near Field ◽  
Periodic Nanostructure

scholarly journals Controlling the near-field excitation of nano-antennas with phase-change materials

2013 ◽  
Vol 4 ◽  
pp. 632-637 ◽  
Author(s):  
Tsung Sheng Kao ◽  
Yi Guo Chen ◽  
Ming Hui Hong
Keyword(s):  
Thin Layer ◽  
Phase Change ◽  
Hot Spots ◽  
Phase Change Materials ◽  
Near Field ◽  
Plasmon Coupling ◽  
New Approach ◽  
Field Excitation ◽  
Bio Assay ◽  
Nano Antennas

By utilizing the strongly induced plasmon coupling between discrete nano-antennas and quantitatively controlling the crystalline proportions of an underlying Ge2Sb2Te5 (GST) phase-change thin layer, we show that nanoscale light localizations in the immediate proximity of plasmonic nano-antennas can be spatially positioned. Isolated energy hot-spots at a subwavelength scale can be created and adjusted across the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications.

Fabry-Perot cavity amplification of near-field thermal rectification

2020 ◽  
Vol 251 ◽  
pp. 107023
Author(s):  
Cheng-Long Zhou ◽  
Lei Qu ◽  
Yong Zhang ◽  
Hong-Liang Yi
Keyword(s):  
Near Field ◽  
Thermal Rectification ◽  
Fabry Perot

Near-field phase-change optical recording over 1.2 numerical aperture

1999 ◽  
Author(s):  
Koichiro Kishima ◽  
Yuji Kuroda ◽  
Kimihiro Saito ◽  
Kiyoshi Osato ◽  
Kenji Yamamoto ◽  
...  
Keyword(s):  
Phase Change ◽  
Near Field ◽  
Numerical Aperture ◽  
Optical Recording ◽  
Field Phase
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