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We experimentally study Poynting vector flows when terahertz waves transmit through a multiple slit arrays. Our methods provide a new way of visualizing energy flows and determining different diffraction orders in the near-field.
We report that the terahertz transparency occurs at the fundamental shape resonance of the rectangular holes regardless of the areal coverage. The funneling of energy at the fundamental resonance is also confirmed at the near-field.
We experimentally study Poynting vector flows when terahertz waves transmit through a multiple slit arrays. Our methods provide a new way of visualizing energy flows and determining different diffraction orders in the near-field.
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