利用陶瓷光源对宽带中红外信号进行调制近场光谱提取。

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

作者信息

Ishikawa Michio, Katsura Makoto, Nakashima Satoru, Aizawa Kento, Inoue Tsutomu, Okamura Hidekazu, Ikemoto Yuka

机构信息

Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan.

出版信息

Opt Express. 2011 Jun 20;19(13):12469-79. doi: 10.1364/OE.19.012469.

DOI:10.1364/OE.19.012469

PMID:21716486

Abstract

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 Ω by a piezo-electric actuator, and the Ω component was extracted from the signal with a lock-in detection. With Ω=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).

摘要

为了获得宽带近场红外（IR）光谱，将傅里叶变换红外光谱仪（FT-IR）和陶瓷光源与散射型扫描近场光学显微镜（s-SNOM）一起使用。为了抑制背景（远场）散射，通过压电致动器以频率Ω调制散射探针与样品之间的距离，并通过锁定检测从信号中提取Ω分量。当Ω = 30 kHz，峰峰值调制幅度为198 nm，且尖端附近表面光滑的探针时，可在1200 - 2500 cm⁻¹范围内获得宽带近场红外光谱。