Thermosensitive strontium titanate(SrTiO3)as a ferroelectric crystal with great tunability in microwave and terahertz band shows unparalleled potential value.Utilizing the thermal electromagnetic tunability to achieve...Thermosensitive strontium titanate(SrTiO3)as a ferroelectric crystal with great tunability in microwave and terahertz band shows unparalleled potential value.Utilizing the thermal electromagnetic tunability to achieve the intelligent manipulation,a thermal-tunable metamaterial with terahertz-band absorption based on SrTiO3 crystal was proposed in this paper.The absorbent metamaterial(AM)is formed by Floquet’s linear periodic arranged unit,which is composed of a metallic ground plane and embedded cross SrTiO3 material in rhombic metallic patch,and separated by FR-4 dielectric spacer.The broadband frequency tunability of AM was operated by changing the temperature.The permittivity of SrTiO3 was discussed in detail to illustrate how the reconfigurability with thermal transformation is generated.The numerical results show that the tunable broadband of the absorbent band has reached 90 GHz and the corresponding absorptivity is above 99% when the temperature increases from 280 K to 360 K.The resonance frequency will produce a blue-shift with the increase of the temperature.This paper presents a passive thermal-tunable metamaterial as a potential candidate for sensing,materials detection and frequency selective thermal emitters.展开更多
基金National Natural Science Foundation of China(No.U1637212)National Defense Pre-research Foundation of China(No.61404130402)+1 种基金Fund for“1331 Project”Key Subject Construction of Shanxi ProvinceFund for Key Laboratory(No.61428050104)。
文摘Thermosensitive strontium titanate(SrTiO3)as a ferroelectric crystal with great tunability in microwave and terahertz band shows unparalleled potential value.Utilizing the thermal electromagnetic tunability to achieve the intelligent manipulation,a thermal-tunable metamaterial with terahertz-band absorption based on SrTiO3 crystal was proposed in this paper.The absorbent metamaterial(AM)is formed by Floquet’s linear periodic arranged unit,which is composed of a metallic ground plane and embedded cross SrTiO3 material in rhombic metallic patch,and separated by FR-4 dielectric spacer.The broadband frequency tunability of AM was operated by changing the temperature.The permittivity of SrTiO3 was discussed in detail to illustrate how the reconfigurability with thermal transformation is generated.The numerical results show that the tunable broadband of the absorbent band has reached 90 GHz and the corresponding absorptivity is above 99% when the temperature increases from 280 K to 360 K.The resonance frequency will produce a blue-shift with the increase of the temperature.This paper presents a passive thermal-tunable metamaterial as a potential candidate for sensing,materials detection and frequency selective thermal emitters.
