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Applied Physics Letters / Volume 93 / Issue 11 / PLASMAS AND ELECTRICAL DISCHARGES

Appl. Phys. Lett. 93, 111503 (2008); http://dx.doi.org/10.1063/1.2987486 (3 pages)

Exciting circular TEmn modes at low terahertz region

T. H. Chang, C. H. Li, C. N. Wu, and C. F. Yu

Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan

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(Received 17 July 2008; accepted 28 August 2008; published online 18 September 2008)

This work proposes an approach to generate circular TEmn modes at low terahertz region through sidewall couplings. With proper arrangement of the couplings on the circumference of the waveguide, they then jointly excite the desired mode. A model is developed to calculate the coupling strength and to analyze the mode purity. Accordingly, three mode converters TE21, TE01, and TE41, were designed, built, and tested at W-band. Back-to-back transmission measurements exhibit excellent agreement with the results of simulations. The measured optimal transmissions are 91%, 95%, and 89% with 3 dB bandwidths of 18.3, 24.0, and 20.2 GHz, respectively.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

optical waveguides, submillimetre wave propagation

PACS

  • 41.20.Jb

    Electromagnetic wave propagation; radiowave propagation

  • 42.79.Gn

    Optical waveguides and couplers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2987486

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    K. R. Chu, Rev. Mod. Phys. 76, 489 (2004).

    W. He, A. W. Cross, A. D. R. Phelps, K. Ronald, C. G. Whyte, S. V. Samsonov, V. L. Bratman, and G. G. Denisov, Appl. Phys. Lett. 89, 091504 (2006)APPLAB000089000009091504000001.

    M. Blank, B. G. Danly, B. Levush, P. E. Latham, and D. E. Pershing, Phys. Rev. Lett. 79, 4485 (1997).

    T. H. Chang and C. F. Yu, Rev. Sci. Instrum. 76, 074703 (2005)RSINAK000076000007074703000001.

    T. H. Chang, C. T. Fan, K. F. Pao, and K. R. Chu, Appl. Phys. Lett. 90, 191501 (2007)APPLAB000090000019191501000001.


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