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

M. Ishikawa | Zendy; M. Katsura | Zendy; Satοru Nakashima | Zendy; Kento Aizawa | Zendy; Tsutomu Inoue | Zendy; H. Okamura | Zendy; Yuka Ikemoto | Zendy

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

Author(s) -

M. Ishikawa,

M. Katsura,

Satοru Nakashima,

Kento Aizawa,

Tsutomu Inoue,

H. Okamura,

Yuka Ikemoto

Publication year - 2011

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.19.012469

Subject(s) - optics , materials science , scattering , near field scanning optical microscope , spectrometer , infrared , signal (programming language) , forward scatter , light scattering , optical microscope , scanning electron microscope , physics , computer science , programming language

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).

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