![]() Phase retarders (PRs), that is, devices that induce a phase shift on the transmitted or reflected wave, are fundamental parts of any communication or electromagnetic processing system. However, having control over the phase has always been quite important. While a general non-vacuum material is an electromagnetic reflective/absorptive attenuator by nature, its phase transfer function is normally quite hard to manipulate. 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. The exploited medium allows a broadband rotation, up to 194°/T, obtained using a SrFe 12O 19 terahertz-transparent permanent magnet. 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. 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. ![]() 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 Faraday isolator is an electromagnetic non-reciprocal device, a key element in photonics. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |