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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMAL RECTIFIER BASED ON NEAR-FIELD THERMAL RADIATION OF NANOSTRUCTURES

Get access (open in a dialog) DOI: 10.1615/IHTC16.rti.023295
pages 8337-8343

Resumo

As an analog of electronic rectifiers, thermal rectifiers have recently received intensive attention due to their stark strengths, e.g., hardly ineffectiveness and failure at high temperatures. Nevertheless, suffering from low rectification contrasts is one of the major problems inhibiting the development and commercialization of thermal rectifiers. This paper proposes an efficient contactless thermal rectifier based on the near-field thermal radiation between intrinsic silicon grating and silica plate. The rectification ratio is predicted to be 22.4 at the filling factor of 0.2 and gap distance of 5 nm, which is two times as high as that of flat-plate counterpart. This extraordinary performance mainly lies in the higher forward and lower reverse radiative heat flux compared with the flat-plate rectifier, which is caused by a higher local density of states in a broader wavevector region and smaller cut-off wavevector of nanostructures for the forward and reversed scheme, respectively. This work opens new routes to realize high performance thermal rectifiers, and may have wide applications in efficient thermal computing, thermal information processing, and thermal management.