Radiative Heat Transfer at the Nanoscale

By Pramod Reddy

Mechanical Engineering, University of Michigan, Ann Arbor, MI

Published on

Abstract

Radiative heat transfer between objects separated by nanometer-sized gaps is of considerable interest due to its promise for non-contact modulation of heat transfer and for several energy conversion applications. Although radiative heat transfer at macroscopic distances is well understood, radiative heat transfer at the nanoscale remains largely unexplored. In this talk, I will describe ongoing efforts in our group to experimentally elucidate nanoscale heat radiation. Specifically, I will present our recent experimental work where we have addressed the following questions: 1) Can existing theories accurately describe radiative heat transfer in single nanometer sized gaps1? 2) What is the role of film thickness on nanoscale radiation2? and 3) Can radiative thermal conductances that are orders of magnitude larger than those between blackbodies be achieved3? In order to address these questions we have developed a variety of instrumentation including novel nanopositioning platforms and microdevices, which will also be described. Finally, I will briefly outline how these advances can be leveraged for future investigations of nanoscale radiative heat transport, near-field thermophotovoltaic energy conversion and near-field based solid-state refrigeration.

Bio

Pramod Reddy Prof. Pramod Reddy received a B. Tech and M. Tech in Mechanical Engineering from the Indian Institute of Technology, Bombay in 2002, and a Ph.D. in Applied Science and Technology from the University of California, Berkeley in 2007. He was a recipient of the NSF CAREER award in 2009, and the DARPA Young Faculty Award in 2012. He is currently an associate professor in the departments of Mechanical Engineering and Materials Science and Engineering at the University of Michigan, Ann Arbor.

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References

  1. K. Kim, B. Song, V. Fernández-Hurtado, W. Lee, W. Jeong, L. Cui, D. Thompson, J. Feist, M. T. H. Reid, F. J. García-Vidal, J. C. Cuevas, E. Meyhofer and P. Reddy, “Radiative heat transfer in the extreme near-field”, Nature 528, 387-391 (2015).
  2. B. Song, Y. Ganjeh, S. Sadat, D. Thompson, A. Fiorino, V. Fernández-Hurtado, J. Feist, F. J. García-Vidal, J. C. Cuevas, P. Reddy and E. Meyhofer, “Enhancement of near-field radiative heat transfer using polar dielectric thin films“, Nature Nanotechnology 10, 253-258 (2015).
  3. B. Song, D. Thompson, A. Fiorino, Y. Ganjeh, P. Reddy and E. Meyhofer, “Radiative heat conductance between dielectric and metallic parallel plates at nanoscale gaps”, Nature Nanotechnology 11, 509-514 (2016).

Cite this work

Researchers should cite this work as follows:

  • Pramod Reddy (2016), "Radiative Heat Transfer at the Nanoscale," http://nanohub.org/resources/25420.

    BibTex | EndNote

Time

Location

Room 2001, Birck Nanotechnology Center, Purdue University, West Lafayette, IN

Tags

Radiative Heat Transfer at the Nanoscale
  • Radiative Heat Transfer at the Nanoscale 1. Radiative Heat Transfer at the… 0
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  • Acknowledgements 2. Acknowledgements 20.587253920587255
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  • Overview of Research 3. Overview of Research 60.093426760093429
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  • Current Research: Tools for Nanoscale Thermal Imaging 4. Current Research: Tools for Na… 176.64330997664331
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  • Demonstration of Quantitative Measurements 5. Demonstration of Quantitative … 256.99032365699031
    00:00/00:00
  • Topography and Thermal Fields of a 200 nm Wide Line 6. Topography and Thermal Fields … 361.22789456122791
    00:00/00:00
  • Thermal Imaging of Bowtie Structures 7. Thermal Imaging of Bowtie Stru… 425.99265932599269
    00:00/00:00
  • Current Research: Tools for High Resolution Calorimetry 8. Current Research: Tools for Hi… 507.40740740740745
    00:00/00:00
  • Nanoscale Radiative Heat Transfer 9. Nanoscale Radiative Heat Trans… 594.361027694361
    00:00/00:00
  • Fundamentals of Thermal Radiation 10. Fundamentals of Thermal Radiat… 599.733066399733
    00:00/00:00
  • Basics of Far Field Radiative Heat Transfer 11. Basics of Far Field Radiative … 698.13146479813145
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  • Planck's Far-Field Radiation Theory 12. Planck's Far-Field Radiation T… 781.61494828161494
    00:00/00:00
  • What is Near-field Thermal Radiation? 13. What is Near-field Thermal Rad… 820.653987320654
    00:00/00:00
  • Formalism for Quantifying Near Field Radiation 14. Formalism for Quantifying Near… 853.78712045378711
    00:00/00:00
  • Computed Results from Fluctuational Electrodynamics 15. Computed Results from Fluctuat… 911.04437771104438
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  • Computational Predictions (Select Examples) 16. Computational Predictions (Sel… 958.82549215882557
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  • Thermophotovoltaic Energy Conversion (Potential use of near-field thermal radiation) 17. Thermophotovoltaic Energy Conv… 982.28228228228227
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  • Solid State Cooling (Potential use of near-field thermal radiation) 18. Solid State Cooling (Potential… 1041.4414414414414
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  • Past Experimental Work 19. Past Experimental Work 1104.270937604271
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  • Parallel Plate Measurements 20. Parallel Plate Measurements 1104.9382716049383
    00:00/00:00
  • Parallel Plate Measurements 21. Parallel Plate Measurements 1168.9022355689024
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  • Nanoscale Measurements 22. Nanoscale Measurements 1196.8301634968302
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  • Extreme Near Field Measurements 23. Extreme Near Field Measurement… 1291.6583249916585
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  • Probing Radiative Heat Transfer in the Extreme Near-Field 24. Probing Radiative Heat Transfe… 1375.9092425759093
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  • Fluctuational Electrodynamics 25. Fluctuational Electrodynamics 1406.8068068068069
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  • Extreme Near Field Measurements 26. Extreme Near Field Measurement… 1417.8845512178846
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  • Our Scanning Probe Based Approach 27. Our Scanning Probe Based Appro… 1420.5538872205539
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  • Custom-Made Scanning Thermal Probe 28. Custom-Made Scanning Thermal P… 1455.8558558558559
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  • Probe Thermal Resistance Measurement 29. Probe Thermal Resistance Measu… 1489.9899899899901
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  • SThM Probe Coated with SiO2 30. SThM Probe Coated with SiO2 1568.5352018685353
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  • How is Radiative Heat Flow Measured 31. How is Radiative Heat Flow Mea… 1589.2225558892226
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  • Measurement of Snap-in Distance 32. Measurement of Snap-in Distanc… 1649.2492492492493
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  • SiO2-SiO2: Measured Probe Temperature in Extreme Near-Field & Mechanical Contact 33. SiO2-SiO2: Measured Probe Temp… 1723.6236236236236
    00:00/00:00
  • SiO2-SiO2: Experiments Agree with Computation 34. SiO2-SiO2: Experiments Agree w… 1749.5161828495163
    00:00/00:00
  • Capturing Critical Experimental Details in Computational Predictions of Extreme Near-Field Radiation 35. Capturing Critical Experimenta… 1801.5015015015015
    00:00/00:00
  • Experimental Data Agreement with Theory 36. Experimental Data Agreement wi… 1833.6336336336337
    00:00/00:00
  • Au-Au: Unmodulated Measurements of eNFRHT Show No Gap-Dependence 37. Au-Au: Unmodulated Measurement… 1893.5935935935936
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  • Au-Au: Modulated Heating of the Emitter Improves Heat Flow Resolution 38. Au-Au: Modulated Heating of th… 1924.290957624291
    00:00/00:00
  • Au-Au: eNFRHT Resolved & Analyzed 39. Au-Au: eNFRHT Resolved & Analy… 1967.6009342676009
    00:00/00:00
  • Spectral & Spatial Distribution of Heat Flux 40. Spectral & Spatial Distributio… 1991.2245578912246
    00:00/00:00
  • Parallel Plate Nanogap Measurements: Achieving Large Radiative Enhancements 41. Parallel Plate Nanogap Measure… 2103.6036036036035
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  • Can the Radiative Heat Conductance between Parallel Plates Increase by 1000X at the Nanoscale? 42. Can the Radiative Heat Conduct… 2104.7047047047049
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  • Experimental Challenges 43. Experimental Challenges 2114.1808475141811
    00:00/00:00
  • Novel Approach Using Microfabricated Planar Emitter and Receiver Devices 44. Novel Approach Using Microfabr… 2152.0854187520854
    00:00/00:00
  • Thermal Characteristics of the Microdevices 45. Thermal Characteristics of the… 2276.60994327661
    00:00/00:00
  • Custom-Built Nanopositioner to Parallelize Planes & Form Nanoscale Gaps 46. Custom-Built Nanopositioner to… 2310.7107107107108
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  • Experimental Platform: Eliminating Convection & Maintaining Stable nm-Gaps 47. Experimental Platform: Elimina… 2355.6222889556225
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  • Approach for Parallelizing Surfaces 48. Approach for Parallelizing Sur… 2391.0577243910579
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  • Quantification of Achieved Parallelization 49. Quantification of Achieved Par… 2456.9569569569571
    00:00/00:00
  • Experimental Procedure & Raw Data 50. Experimental Procedure & Raw D… 2480.613947280614
    00:00/00:00
  • SiO2-SiO2 : Giant Heat Conductances Observed in nm-Gaps Between Parallel Plates 51. SiO2-SiO2 : Giant Heat Conduct… 2534.6346346346349
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  • Au-Au & SiO2-Au Experiments 52. Au-Au & SiO2-Au Experiments 2588.7220553887223
    00:00/00:00
  • Summary 53. Summary 2620.0533867200534
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  • Future Potential 54. Future Potential 2644.9115782449117
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  • Acknowledgements 55. Acknowledgements 2684.8181514848184
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  • Thank You 56. Thank You 2708.4751418084752
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