Abstract
Hybridization induced transparency (HIT) resulting from the coupling between the material absorption resonance and the artificial structure (metamaterial) resonance provides an effective means of enhancing the sensitivity in the terahertz spectroscopic technique-based sensing applications. However, the application of this method is limited by the versatility to the samples with different volumes, because the samples usually have a refractive index larger than unity and their presence with different thicknesses will lead to a shift of the structure resonance, mismatching the material absorption. In this work, we demonstrate that by using InSb coupled rod structures, whose electromagnetic response in the terahertz band can be easily controlled by using ambient parameters like the temperature or magnetic field, the HIT effect can be easily tuned so that without the needs to change the rod geometry, one can realize efficient terahertz sensing with different sample thickness.
Highlights
The terahertz (THz) band (0.1-10THz), the least explored in the electromagnetic spectrum, is believed to be the most technologically important spectral range, driven by the possibilities of “seeing” through many optically opaque materials like packing plastics and identifying the composition of materials, especially for those with similar colors to human eyes, e.g. wheat powder and drugs [1,2]
We demonstrate that by using InSb coupled rod structures, whose electromagnetic response in the terahertz band can be controlled by using ambient parameters like the temperature or magnetic field, the Hybridization induced transparency (HIT) effect can be tuned so that without the needs to change the rod geometry, one can realize efficient terahertz sensing with different sample thickness
We have shown that, using resonators of a fixed geometry, it is possible to selectively match the structure resonance with the material absorption
Summary
The terahertz (THz) band (0.1-10THz), the least explored in the electromagnetic spectrum, is believed to be the most technologically important spectral range, driven by the possibilities of “seeing” through many optically opaque materials like packing plastics and identifying the composition of materials, especially for those with similar colors to human eyes, e.g. wheat powder and drugs [1,2] Such elemental identification arises from the fact that many chemical molecules have intra-/inter-molecule rotational or vibrational resonances located within this spectral regime. The InSb rod resonance can be adjusted matching the material absorption of the target sample for a variety of thicknesses Such properties can be exploited to simplify the practical implementation of dynamic tuning, eliminating the complexities associated with gated graphene structures, since no electrodes or laborious fabrication processes are required. A tunable HIT effect can be more efficiently achieved, and favorable for the THz sensing for a variety of sample thicknesses
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