Abstract
One of the major limitations of the existing single-pixel terahertz imaging systems is the lack of high speed broadband multi-pixel beam modulators with large modulation depths. So far there has been few works to demonstrate broadband terahertz multi-pixel beam modulators. This is mostly due to the lack of materials with the desired terahertz response and the practical difficulties in scaling the device dimensions for operation at terahertz frequencies. However, metamaterials are found to be a promising candidate for the efficient control and manipulation of terahertz waves. In metamaterials, electromagnetic properties arise from their structure instead of only from the constituent materials. Till now, related researches on the metamaterial-based multi-pixel beam modulators offer limited modulation depth and modulation bandwidth [1-4]. In this paper, we demonstrate a polarization-independent broadband terahertz modulator based on reconfigurable metallic metamaterials with higher modulation depth and higher modulation bandwidth.
© 2011 Optical Society of America
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