Automatically Aligned and Environment-Friendly Twisted Stacking Terahertz Chiral Metasurface with Giant Circular...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Chiral metasurfaces generate superchiral fields, crucial for optoelectronics and biosensing.
• Conventional fabrication methods are slow, expensive, and complex, limiting commercial use.

Purpose of the Study:

• To propose a novel, rapidly fabricated terahertz (THz) chiral metasurface (TCM).
• To demonstrate its application in enhanced biosensing using laser-induced graphene (LIG) technology.

Main Methods:

• Developed a twisted stacking carbon-based TCM using laser-induced graphene (LIG).
• Employed a two-step process: polyimide film adhesion followed by laser direct writing for automatic alignment.
• Achieved high-speed fabrication with a 15 × 15 mm TCM produced in 60 seconds.

Main Results:

• Realized a giant circular dichroism (CD) ranging from +99.5% to -99.6% due to LIG's superior THz dissipation.
• Demonstrated THz biosensing of bovine serum albumin with a wide sensing range (0.5-50 mg mL⁻¹).
• Achieved high sensitivity in biosensing: ΔCD: 2.09% (mg mL⁻¹)⁻¹ and Δf: 0.0034 THz (mg mL⁻¹)⁻¹.

Conclusions:

• The LIG-based TCM offers an environmentally friendly platform for chiral research.
• This technology presents significant potential for rapid, low-cost commercial biosensing applications.