A magnetic non-reciprocal isolator for broadband terahertz operation


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SHALABY M., PECCIANTI M., Ozturk Y. , MORANDOTTI R.

NATURE COMMUNICATIONS, cilt.4, 2013 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 4
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1038/ncomms2572
  • Dergi Adı: NATURE COMMUNICATIONS

Özet

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 degrees/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.