Dielectric material was used as the probe material for a scattering-type terahertz scanning near-field optical microscope (THz S-SNOM). It was found that the dielectric probe exhibits a strong near-field scattering signal with an amplitude comparable to that of the metallic probe. The behavior of the electric near-field around the tip was calculated using the finite-difference time-domain method, showing the field enhancement comparable to that of the metallic probe. The dielectric probe also exhibited a faster temporal response compared to the response of the metallic probe. Introduction of a non-metallic probe would enlarge the application field of the THz S-SNOM technique.
REFERENCES
1.
A. J. L.
Adam
, J. Infrared Millimeter. Terahertz. Waves
32
, 976
(2011
).2.
S.
Hunsche
, M.
Koch
, I.
Brener
, and M. C.
Nuss
, Opt. Commun.
150
, 22
(1998
).3.
V.
Astley
, R.
Mendis
, and D. M.
Mittleman
, Appl. Phys. Lett.
95
, 031104
(2009
).4.
C. A.
Werley
, K.
Fan
, A. C.
Strikwerda
, S. M.
Teo
, X.
Zhang
, R. D.
Averitt
, and K. A.
Nelson
, Opt. Express
20
, 8551
(2012
).5.
H.-T.
Chen
, R.
Kersting
, and G. C.
Cho
, Appl. Phys. Lett.
83
, 3009
(2003
).6.
A. J.
Huber
, F.
Keilmann
, J.
Wittborn
, J.
Aizpurua
, and R.
Hillenbrand
, Nano Lett.
8
, 3766
(2008
).7.
S.
Patanè
, P. G.
Gucciardi
, M.
Labardi
, and M.
Allegrini
, Riv. Nuovo Cimento
27
, 1
(2004
).8.
G. C.
Cho
, H.-T.
Chen
, S.
Kraatz
, N.
Karpowicz
, and R.
Kersting
, Semicond. Sci. Technol.
20
, S286
(2005
).9.
K.
Wang
, D. M.
Mittleman
, N. C. J.
van der Valk
, and P. C. M.
Planken
, Appl. Phys. Lett.
85
, 2715
(2004
).10.
V.
Astley
, H.
Zhan
, R.
Mendis
, and D. M.
Mittleman
, J. Appl. Phys.
105
, 113117
(2009
).11.
M. B.
Raschke
and C.
Lienau
, Appl. Phys. Lett.
83
, 5089
(2003
).12.
K. N.
Kocharyan
, M. N.
Afsar
, and I. I.
Tkachov
, IEEE Trans. Microw. Theory Tech.
47
, 2636
(1999
).13.
K. A.
Korolev
, S.
Chen
, and M. N.
Afsar
, IEEE Trans. Magn.
44
, 435
(2008
).14.
S. A.
Maier
and H. A.
Atwater
, J. Appl. Phys.
98
, 011101
(2005
).15.
A.
Bouhelier
, Microsc. Res. Tech.
69
, 563
(2006
).16.
F.
Keilmann
and R.
Hillenbrand
, Philos. Trans. R. Soc. London, Ser. A
362
, 787
(2004
).17.
B.
Knoll
and F.
Keilmann
, Opt. Commun.
182
, 321
(2000
).18.
Q.
Zhao
, J.
Zhou
, F.
Zhang
, and D.
Lippens
, Mater. Today
12
, 60
(2009
).19.
H.-T.
Chen
, S.
Kraatz
, G. C.
Cho
, and R.
Kersting
, Phys. Rev. Lett.
93
, 267401
(2004
).© 2013 AIP Publishing LLC.
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