Thermally excited near-field radiation and far-field interference

Optics Express

Volumn 19, Issue 8, 2011, Pages 7695-7704

  Kajihara, Yusuke ^a,b   Kosaka, Keishi ^a   Komiyam, Susumu ^a  

^a UNIVERSITY OF TOKYO   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

DECAY LENGTH; EVANESCENT WAVE; EXTERNAL ILLUMINATION; FAR-FIELD; FAR-FIELD SIGNALS; GAAS; IN-PLANE; INTERFERENCE PATTERNS; MATERIAL SURFACE; NEAR FIELD RADIATION; NEAR FIELD SIGNALS; NEAR-FIELD IMAGES; NEAR-FIELD ZONES; SCANNING NEAR-FIELD OPTICAL MICROSCOPE; SINUSOIDAL FUNCTIONS; SPATIAL INTERFERENCE; SPATIAL RESOLUTION; STANDING WAVE; THERMAL RADIATIONS;

SILICON CARBIDE;

EID: 79953849761     PISSN: None     EISSN: 10944087     Source Type: Journal    
DOI: 10.1364/OE.19.007695     Document Type: Article

References (31)

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17. For signal modulation, fTF = 32.7 kHz is too high for the high performance of CSIP detectors so that fM = 10 Hz is applied.
18. We derived theoretical profiles from the electromagnetic local density of states (LDOS, [2]) by considering the scattering efficiency in terms of the point-dipole model [19]. The derived theoretical profile agrees relatively well with the experimental results. For quantitative comparison, however, it remains some ambiguity as to the scattering efficiency.
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20. As discussed in [19], scattering amplitude of a probe rapidly decreases with h in a range 0 < h < R (radius of apex curvature), which would cause the signals I0, If, and I2f to rapidly decrease. Nevertheless, if the near-field contains a long-extending component, I0 and If will have additional slow decay components.
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. 2. 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.
26. M. Born, and E. Wolf, Principles of Optics, 7th edition, (Cambridge Univ. Press, Cambridge, 1999).
27. 1 ∼φ + 0.0005 should be taken if a sphere dipole model is assumed as in [19].
28. J. C. Brice, Properties of Gallium Arsenide, 2nd edition, (INSPEC, London, 1990).
29. M. Wakaki, K. Kudo, and T. Shibuya, Physical Properties and Data of Optical Materials, (CRC Press, Boca Raton, 2007).
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.