Observation of optical states below light cone with compound lattices [article]

Jiajun Wang, Ang Chen, Maoxiong Zhao, Wenzhe Liu, Yiwen Zhang, Xiaohan Liu, Lei Shi, Jian Zi
2018 arXiv   pre-print
For optical systems, states inside the light cone could be detected by far-field measurement, while those below the light cone are not detectable by far-field measurement. A new method for far-field detection has been developed for observing states below the light cone with compound lattices. The basic mechanism involved is that periodic weak scattering leads to band folding, making the states out of the light cone to occur inside. By using polarization-resolved momentum-space imaging
more » ... py the band structures and iso-frequency contours of plasmonic lattices with different dimensions and symmetries are experimentally mapped out, in good agreement with the simulation.
arXiv:1811.10235v1 fatcat:ggt4b2wdmnh3bbiqw7f4e2umni