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A magnetic non-reciprocal isolator for broadband terahertz operation

Author

Listed:
  • Mostafa Shalaby

    (INRS-EMT)

  • Marco Peccianti

    (Institute for Complex Systems-CNR)

  • Yavuz Ozturk

    (INRS-EMT
    Ege University)

  • Roberto Morandotti

    (INRS-EMT)

Abstract

A Faraday isolator is an electromagnetic non-reciprocal device, a key element in photonics. It is required to shield electromagnetic sources against the effect of back-reflected light, as well as to limit the detrimental effect of back-propagating spontaneous emissions. A common isolator variant, the circulator, is widely used to obtain a complete separation between forward- and backward-propagating waves, thus enabling the realization of a desired transfer function in reflection only. Here we demonstrate a non-reciprocal terahertz Faraday isolator, operating on a bandwidth exceeding one decade of frequency, a necessary requirement to achieve isolation with the (few-cycle) pulses generated by broadband sources. The exploited medium allows a broadband rotation, up to 194°/T, obtained using a SrFe12O19 terahertz-transparent permanent magnet. This in turn enables the design of a stand-alone complete terahertz isolator without resorting to an external magnetic field bias, as opposed to all the optical isolators realized so far.

Suggested Citation

  • Mostafa Shalaby & Marco Peccianti & Yavuz Ozturk & Roberto Morandotti, 2013. "A magnetic non-reciprocal isolator for broadband terahertz operation," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2572
    DOI: 10.1038/ncomms2572
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