Terahertz artificial material based on integrated metal-rod-array for phase sensitive fluid detection

Transverse-electric (TE) polarized terahertz (THz) waves along a three-layered metal-rod-array (MRA) are demonstrated to identify liquid molecular dipole moments based on the extended optical-path-Iengths. The minute sensing ability is less than 0.1 mmol, equaling $2.7 \ \mu \mathbf{mol}/\mathbf{mm}^{2}$ adsorption density.

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