Graphene-Based Optical Antenna

Ultra-broadband IR absorption

A layered graphene/Si₃N₄ antenna with electrically tunable ultra-broadband infrared absorption and capability to convert infrared radiation into visible fluorescence.

Xuan, Shao · Yang, Guang · 75600471 · Liu, Taige · Fangchen, You · Zongtao, Chen · Wang, Haiwei · Zhang, Xinyu

Optics Express 2026

Specifications

Average IR absorptivity

{'zh': '86.1', 'en': '86.1'} %

IR absorptivity (electrically tuned)

{'zh': '88.54', 'en': '88.54'} %

Reflectivity variance

{'zh': '23.09', 'en': '23.09'} %

Fluorescence conversion central wavelength

{'zh': '544', 'en': '544'} nm

pc-to-dc ratio (near-IR conversion)

{'zh': '13.78', 'en': '13.78'}

pc-to-dc ratio (red light conversion)

{'zh': '31.13', 'en': '31.13'}

Advantages

Ultra-broad absorption band

An average absorptivity of 86.1% over 1–25 µm covers near-IR to mid/far-IR, enabling multi-band detection without changing the component.

Electrically tunable absorption

Applying a bias voltage of 0–20 V yields an absorptivity of 88.54% and a reflectivity variance of 23.09% in 1–15 µm, enabling dynamic modulation.

IR-to-visible conversion

Converts near-IR at 2.2 µm into visible fluorescence at 544 nm, achieving a pc-to-dc ratio of 13.78 after MCP and fluorescent screen, suitable for visible imaging.

Applications

• Broadband IR absorber：Serves as a broadband IR absorption layer covering 1–25 µm for IR detection and thermal imaging.
• IR-to-visible fluorescence conversion sensor：Converts invisible IR into 544 nm visible fluorescence for detection by conventional cameras or naked eye.
• Microchannel plate imaging：Coupled with MCP and fluorescent screen to achieve high gain for low-light imaging enhancement.