期刊
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
卷 38, 期 9, 页码 1085-1097出版社
SPRINGER
DOI: 10.1007/s10762-017-0391-0
关键词
Photonic crystal; Cavity; Resonant tunneling diode; Terahertz; Sensing
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [15K13952]
- Core Research for Evolutional Science & Technology (CREST) program of the Japan Science and Technology Agency (JST) [JPMJCR1534]
- Grants-in-Aid for Scientific Research [15K13952] Funding Source: KAKEN
In this paper, we report on a terahertz (THz) sensing system. Compared to previously reported systems, it has increased system sensitivity and reduced size. Both are achieved by using a photonic crystal (PC) cavity as a resonator and compact resonant tunneling diodes (RTDs) as signal source and as detector. The measured quality factor of the PC cavity is higher than 10,000, and its resonant frequency is 318 GHz. To demonstrate the operation of the refractive index sensing system, dielectric tapes of various thicknesses are attached to the PC cavity and the change in the resonator's refractive index is measured. The figure of merit of refractive index sensing using the developed system is one order higher than that of previous studies, which used metallic metamaterial resonators. The frequency of the RTD-based source can be swept from 316 to 321 GHz by varying the RTD direct current voltage. This effect is used to realize a compact frequency tunable signal source. Measurements using a commercial signal source and detector are carried out to verify the accuracy of the data obtained using RTDs as a signal source and as a detector.
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