TY - JOUR
T1 - Apertureless scanning near-field optical microscopy
T2 - A comparison between homodyne and heterodyne approaches
AU - Gomez, Lewis
AU - Bachelot, Renaud
AU - Bouhelier, Alexandre
AU - Wiederrecht, Gary P.
AU - Chang, Shih Hui
AU - Gray, Stephen K.
AU - Hua, Feng
AU - Jeon, Seokwoo
AU - Rogers, John A.
AU - Castro, Miguel E.
AU - Blaize, Sylvain
AU - Stefanon, Ilan
AU - Lerondel, Gilles
AU - Royer, Pascal
PY - 2006/5
Y1 - 2006/5
N2 - In coherent homodyne apertureless scanning near-field optical microscopy (ASNOM) the background field cannot be fully suppressed because of the interference between the different collected fields, making the images difficult to interpret. We show that implementing the heterodyne version of ASNOM allows one to overcome this issue. We present a comparison between homodyne and heterodyne ASNOM through near-field analysis of gold nanowells, integrated waveguides, and a single evanescent wave generated by total internal reflection. The heterodyne approach allows for the control of the interferometric effect with the background light. In particular, the undesirable background is shown to be replaced by a controlled reference field. As a result, nearfield information undetectable by a homodyne ASNOM is extracted by use of the heterodyne approach. Additionally, it is shown that field amplitude and field phase can be detected separately.
AB - In coherent homodyne apertureless scanning near-field optical microscopy (ASNOM) the background field cannot be fully suppressed because of the interference between the different collected fields, making the images difficult to interpret. We show that implementing the heterodyne version of ASNOM allows one to overcome this issue. We present a comparison between homodyne and heterodyne ASNOM through near-field analysis of gold nanowells, integrated waveguides, and a single evanescent wave generated by total internal reflection. The heterodyne approach allows for the control of the interferometric effect with the background light. In particular, the undesirable background is shown to be replaced by a controlled reference field. As a result, nearfield information undetectable by a homodyne ASNOM is extracted by use of the heterodyne approach. Additionally, it is shown that field amplitude and field phase can be detected separately.
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U2 - 10.1364/JOSAB.23.000823
DO - 10.1364/JOSAB.23.000823
M3 - Article
AN - SCOPUS:33745744539
SN - 0740-3224
VL - 23
SP - 823
EP - 833
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
IS - 5
ER -