Sub-terahertz scanning near-field optical microscope using a quartz tuning fork based probe

Author:

Li Xinxing123ORCID,Sun Jiandong23,Jin Lin23,Shangguan Yang23,Chen Kebei12,Qin Hua123

Affiliation:

1. University of Science and Technology of China

2. Suzhou Institute of Nano-Tech and Nano-Bionics

3. Key Laboratory of Nanodevices of Jiangsu Province

Abstract

We report a sub-terahertz scattering-type scanning near-field microscope (sub-THz s-SNOM) which uses a 6 mm long metallic tip driven by a quartz tuning fork as the near-field probe. Under continuous-wave illumination by a 94 GHz Gunn diode oscillator, terahertz near-field images are obtained by demodulating the scattered wave at both the fundamental and the second harmonic of the tuning fork oscillation frequency together with the atomic-force-microscope (AFM) image. The terahertz near-field image of a gold grating with a period of 2.3 µm obtained at the fundamental modulation frequency agrees well with the AFM image. The experimental relationship between the signal demodulated at the fundamental frequency and the tip-sample distance is well fitted with the coupled dipole model indicating that the scattered signal from the long probe is mainly contributed by the near-field interaction between the tip and the sample. This near-filed probe scheme using quartz tuning fork can adjust the tip length flexibly to match the wavelength over the entire terahertz frequency range and allows for operation in cryogenic environment.

Funder

National Natural Science Foundation of China

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Suzhou Science and Technology Plan Project

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Dynamic Imaging Simulation of Targets in Terahertz Band Based on BRDF;2024 Photonics & Electromagnetics Research Symposium (PIERS);2024-04-21

2. Research progress of lock-in amplifiers;Acta Physica Sinica;2023

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