Near-field thermal imaging of nanostructured surfaces

Kittel, A.; Wischnath, Uli F.; Welker, Joachim; Huth, Oliver; Rüting, Felix; Biehs, Svend‐Age

doi:10.1063/1.3025140

Cited by 107 publications

(86 citation statements)

References 23 publications

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“…The authors found their measurements were qualitatively consistent with theoretical predictions. However, Kittel et al [34] found the contrary by measuring the power absorbed or emitted by the tip of a thermal profiler and a planar surface under high vacuum conditions. At distances below 10 nm, their experimental results deviated significantly from the predictions from fluctuating electrodynamics.…”

Section: Nanoscale Radiationmentioning

confidence: 99%

Harvesting Nanoscale Thermal Radiation Using Pyroelectric Materials

Fang

Frederich

Pilon

2010

Journal of Heat Transfer

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Section: Nanoscale Radiationmentioning

confidence: 99%

Harvesting Nanoscale Thermal Radiation Using Pyroelectric Materials

Fang

Frederich

Pilon

2010

Journal of Heat Transfer

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“…Somewhat more applied studies have attempted to take advantage of the potential of the tremendous increase of the radiative heat flux on the nanoscale for thermal imaging of nanostructured surfaces [21][22][23][24].…”

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confidence: 99%

Modulation of near-field heat transfer between two gratings

Biehs

Rosa

Ben‐Abdallah

2011

Applied Physics Letters

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101

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We present a theoretical study of near-field heat transfer between two uniaxial anisotropic planar structures. We investigate how the distance and relative orientation (with respect to their optical axes) between the objects affect the heat flux. In particular, we show that by changing the angle between the optical axes it is possible in certain cases to modulate the net heat flux up to 90% at room temperature, and discuss possible applications of such a strong effect. 1Since the prediction by Polder and van Hove [1] that the heat exchange between two media at short separations can be much higher than the blackbody limit, numerous works have been carried out to investigate both theoretically and experimentally the physics involved in this transfer. Experimentally, it was shown [2,3] that the radiative heat flux increases for distances shorter than the thermal wavelength and can vastly exceed the black body limit [4,5]. Moreover, very recent experiments [6,7] were in good quantitative agreement with theoretical predictions. On the theoretical side, we can highlight the studies of the heat flux for layered media [8,9], for photonic crystals [10], metamaterials [11], and porous media [12].In addition, the dependence of the heat transfer on the geometry has attracted much interest and has been investigated in a sphere-plane geometry [13,14], for spheroidal particles above a plane surface [15] and between two spheres or nanoparticles [16][17][18][19][20]. Somewhat more applied studies have attempted to take advantage of the potential of the tremendous increase of the radiative heat flux on the nanoscale for thermal imaging of nanostructured surfaces [21][22][23][24].Finally, the formulation of the heat flux in terms of the scattering matrix [25,26] [33] to modulate heat flux between two materials using an electric ac current as external power source. However, due to the properties of these materials, such modulator works reversibly only during a limited number of cycle which typically oscillate between 10 7 and 10 12 . Moreover, such devices work at two discrete levels of flux, one for each state of the phase changing material.In this Letter, we investigate the near-field heat transfer between two polar/metallic misaligned gratings in the long wavelength limit, where they may be described by effective homogeneous anisotropic permittivities. We show that it is possible to get a strong heat flux modulation without cycle limitation just by rotating the relative position of the grating's 2 optical axes [34]. Our approach combines the standard stochastic electrodynamics [35] and the effective medium theory [36][37][38] for the gratings.A sketch of the geometry considered is depicted in Fig. 1. It shows two semi-infinite host materials of complex permittivity ǫ i (ω) (i = 1, 2) with a one dimensional grating engraved on each. The relative orientation of the two gratings is arbitrary in the (x,y) plane, and we assume that their trenches are sufficiently deep so as to (i) render the substrate below those gratings i...

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“…For this program sensitive observables are required; we suggest that measuring individual diagonal components of the near fields' correlation tensors, which give directional weights to the total fluctuation strength, might yield more information than their traces, i.e., the local density of states. Second, leaving theoretical considerations aside, the practical exploitation of the principles outlined in this note for nanoscale thermal imaging [20] would provide novel tools for the diagnosis and characterization of nanostructures.…”

Section: Discussionmentioning

confidence: 99%

“…3 d). Whereas the LDOS merely yields a blurred image of the underlying surface topography [20], the individual diagonal elements D Observe that the scales differ from those in Fig. 3.…”

Section: Numerical Model Calculationsmentioning

confidence: 99%

“…It has already been demonstrated experimentally that the NSThM opens up the possibility of thermal imaging of surface structures with nanoscale resolution [20], since the surface topography leaves its imprint in the local density of states (LDOS). In this paper we take a further step in this direction: We argue that one can obtain information even beyond the mere topography if the NSThM sensor is appropriately shaped.…”

Section: Introductionmentioning

confidence: 99%

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Spheroidal nanoparticles as thermal near-field sensors

Biehs

Huth

Rüting

et al. 2010

Journal of Applied Physics

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We suggest to exploit the shape-dependence of the near-field heat transfer for nanoscale thermal imaging. By utilizing strongly prolate or oblate nanoparticles as sensors one can assess individual components of the correlation tensors characterizing the thermal near field close to a nanostructured surface, and thus obtain directional information beyond the local density of states. Our theoretical considerations are backed by idealized numerical model calculations.

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Near-field thermal imaging of nanostructured surfaces

Cited by 107 publications

References 23 publications

Harvesting Nanoscale Thermal Radiation Using Pyroelectric Materials

Harvesting Nanoscale Thermal Radiation Using Pyroelectric Materials

Modulation of near-field heat transfer between two gratings

Spheroidal nanoparticles as thermal near-field sensors

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