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Opt Express. 2011 May 9;19(10):9050-5. doi: 10.1364/OE.19.009050.

Polarization independent broadband reflectors based on cross-stacked gratings.

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Department of Electrical Engineering, NanoFAB Center, University of Texas at Arlington, Arlington, Texas 76019, USA.


We report here a broadband reflector based on a two cross-stacked grating structure. This type of broadband reflector is polarization-independent, with ~100% reflectance over a designed spectral range of 1.4 to 1.6 μm. The reflection phase differences between TE and TM polarizations remain almost a constant value of 1.2π over the same high reflection spectral range. The reflector performance tolerance was also investigated by varying the grating structure parameters. Two types of Fabry-Perot cavities can be configured based on two cross-stacked grating structures, for both polarization independent and polarization dependent resonance cavity mode control. All these characteristics associated with the cross-stacked grating reflectors enable a new type of resonant cavity or wave plate design for a large range of photonic applications.


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