Modulated near-field spectral extraction of broadband mid-infrared signals with a ceramic light source

作者：Ishikawa Michio^*; Katsura Makoto; Nakashima Satoru; Aizawa Kento; Inoue Tsutomu; Okamura Hidekazu; Ikemoto Yuka

来源：Optics Express, 2011, 19(13): 12469-12479.

DOI：10.1364/OE.19.012469

In order to obtain broadband near-field infrared (IR) spectra, a Fourier-transform IR spectrometer (FT-IR) and a ceramic light source were used with a scattering-type scanning near-field optical microscope (s-SNOM). To suppress the background (far-field) scattering, the distance between the scattering probe and the sample was modulated with frequency Omega by a piezo-electric actuator, and the Omega component was extracted from the signal with a lock-in detection. With Omega=30 kHz, a peak-to-peak modulation amplitude of 198 nm, and a probe with smooth surface near the tip, broadband near-field IR spectra could be obtained in the 1200-2500 cm(-1).

• 出版日期2011-6-20