Scholarlink

<p>This paper presents a terahertz (THz) detector combining graphene and lithium tantalate (LiTaO<sub>3</sub>) that operates based on the Seebeck effect. Absorption of THz radiation by the LiTaO<sub>3</sub> slab generates a small temperature gradient across multiple graphene thermocouples connected in series, forming a thermopile that significantly enhances sensitivity. The device achieves a temperature change exceeding 210 mK and a high responsivity above 2.57&#xa0;V/W at an incident power of 28&#xa0;µW. Its Noise Equivalent Power (NEP) is estimated at approximately 17.1 nW/√Hz, indicating low noise and high detection precision. Compared to conventional antenna-based detectors, this thermopile offers superior sensitivity while being more compact and cost-efficient. Furthermore, it supports detection at frequencies beyond 4 THz, demonstrating a remarkable advantage over previously reported graphene-based THz detectors.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A graphene/lithium tantalate THz detector based on the thermopile effect

  • 期刊论文

  • 发表日期：

    2025年9月19日

查看全文
  • Kaveh Rostami

摘要

This paper presents a terahertz (THz) detector combining graphene and lithium tantalate (LiTaO3) that operates based on the Seebeck effect. Absorption of THz radiation by the LiTaO3 slab generates a small temperature gradient across multiple graphene thermocouples connected in series, forming a thermopile that significantly enhances sensitivity. The device achieves a temperature change exceeding 210 mK and a high responsivity above 2.57 V/W at an incident power of 28 µW. Its Noise Equivalent Power (NEP) is estimated at approximately 17.1 nW/√Hz, indicating low noise and high detection precision. Compared to conventional antenna-based detectors, this thermopile offers superior sensitivity while being more compact and cost-efficient. Furthermore, it supports detection at frequencies beyond 4 THz, demonstrating a remarkable advantage over previously reported graphene-based THz detectors.