Design and verify a dual modulated metasurface in terahertz range

Area of Science:

• Metamaterials and Plasmonics
• Terahertz (THz) Technology
• Sensing Applications

Background:

• Metasurfaces offer unique electromagnetic properties.
• Tunable absorbers are crucial for sensing applications.
• Localized surface plasma (LSP) and dielectric loss modes are key to absorption.

Purpose of the Study:

• To propose and verify a single-peak tunable metasurface absorber in the Terahertz range.
• To investigate the sensing properties of the metasurface absorber.
• To demonstrate the influence of temperature, liquid environment, and pump fluence on absorption.

Main Methods:

• Fabrication and characterization of a single-peak tunable metasurface absorber.
• Experimental manipulation of temperature (300 K to 400 K).
• Exposure of the metasurface to ethanol and chloroform.
• Varying pump fluence to observe absorption changes.

Main Results:

• The metasurface absorber exhibited an initial absorption peak of 83% at 2.98 THz.
• Increasing temperature enhanced absorption to 93.7% at 3.5 THz.
• Covering the sample with ethanol or chloroform also increased absorption and shifted the peak frequency.
• Simultaneous changes in temperature and liquid environment led to more intense resonance.
• Increasing pump fluence reduced the absorption peak.

Conclusions:

• The tunable metasurface absorber demonstrates significant sensing capabilities.
• The device's response to environmental changes (temperature, liquids) is quantifiable.
• This work highlights the potential of metasurface absorbers in terahertz sensing fields.