Abstract

The transmission properties are presented for periodic metamaterials composed of dispersive and gain chiral media. Our numerical results predict that for transverse-electric (TE) and transverse-magnetic (TM) incident waves, the co-polarization transmission enhancement can be realized as the transmittance is larger than 0.9. As the parameters of the unit cell are fixed, the multiband of the co-polarization transmission enhancement with broad bandwidth will be obtained for both TE and TM waves as the angle of incidence varies. Meanwhile, the co-polarization transmission enhancement in an ultrawide incident angle range (${0}\sim 78^\circ$, ${0}\sim 86.3^\circ$) can be achieved for certain frequencies (35.5 GHz, 35.3 GHz). Furthermore, the co-polarization transmission enhancement for TM waves appears in the whole frequency band (${15}\sim 120\;{\rm GHz}$) as the angle of incidence satisfies the range of (${54.9}^\circ \sim 65.9^\circ$). Finally, the suitable frequency band and broad bandwidth of the transmission enhancement for both TE and TM waves can be modulated by adjusting the period $ T $ and the thickness of chiral layer $ a $. We anticipate that this work offers the opportunity for obtaining broadband and wide-angle transmission enhancement for TE and TM waves, which will shed light on the future design of microwave filters.

© 2020 Optical Society of America

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