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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 8 — Apr. 11, 2011
  • pp: 7695–7704

Thermally excited near-field radiation and far-field interference

Yusuke Kajihara, Keishi Kosaka, and Susumu Komiyama  »View Author Affiliations


Optics Express, Vol. 19, Issue 8, pp. 7695-7704 (2011)
http://dx.doi.org/10.1364/OE.19.007695


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Abstract

Thermal radiation from samples of Au layers patterned on GaAs, SiO2, and SiC at 300 K are studied with a scattering-type scanning near-field optical microscope (wavelength: ~14.5 μm), without applying external illumination. Clear near-field images are obtained with a spatial resolution of ~60 nm. All the near field signals derived from different demodulation procedures decrease rapidly with increasing probe height h with characteristic decay lengths of 40 ~60 nm. Near-field images are free from any signature of in-plane spatial interference. The findings are accounted for by theoretically expected surface evanescent waves, which are thermally excited in the close vicinity of material surfaces. Outside the near-field zone (1 μm < h), signals reappear and vary as a sinusoidal function of h, exhibiting a standing wave-like interference pattern. These far-field signals are ascribed to the effect of weak ambient radiation.

© 2011 OSA

OCIS Codes
(110.3080) Imaging systems : Infrared imaging
(110.6820) Imaging systems : Thermal imaging
(260.3160) Physical optics : Interference
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Microscopy

History
Original Manuscript: February 3, 2011
Revised Manuscript: March 19, 2011
Manuscript Accepted: March 22, 2011
Published: April 6, 2011

Citation
Yusuke Kajihara, Keishi Kosaka, and Susumu Komiyama, "Thermally excited near-field radiation and far-field interference," Opt. Express 19, 7695-7704 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-8-7695


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References

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  21. The LDOS is theoretically discussed in [2], which predicts the LDOS (z = 50 nm) on Au is more than 10 times larger than those on the dielectrics (SiC, GaAs, SiO2). The discrepancy with the experimental values arises from the isotropic model of [2]. Larger experimental values certainly arise from the piezoelectric acoustic phonon modes that are not considered in the theoretical treatment.
  22. The near-field signal If near the surface in Fig. 4(a) is a little smaller than that in Fig. 3. The difference is attributed mainly to the probe condition. The signal change is not the problem because the signal characteristics like signal ratio between different materials are independent of the probe condition.
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  25. The effective radiation temperature, Tradiation is estimated by comparing the far-field radiation intensities from 77K-liquid nitrogen, 300K-Au and 300K-SiO2. We can derive Tradiation by knowing the emissivity and the reflectivity of each material and noting that Tradiation and Tsample are respectively relevant to the reflected and the emitted radiations.
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  30. Thermodynamics requires that the interference pattern is visible when Tsample ≠ Tradiation but vanishes in thermal equilibrium, and that it reverses its sign according as Tsample > Tradiation or Tsample < Tradiation. The experimental values shown in Figs. 4–6 are opposite in sign to Relation (2) because Tsample > Tradiation.
  31. The probe tip in [10] is modulated in tapping mode at a frequency much higher than 10 Hz. It is difficult, however, to ascribe the discrepancies to the different method of tip modulation.

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