Imaging visible light using anisotropic metamaterial slab lens.

Area of Science:

• Photonics and Metamaterials
• Nanotechnology
• Optics

Background:

• Anisotropic metamaterials offer unique optical properties.
• Negative refraction is typically associated with a negative phase index.
• Fabrication of bulk metamaterials can be challenging.

Purpose of the Study:

• To demonstrate negative refraction in an anisotropic metamaterial without a negative phase index.
• To fabricate such a metamaterial using a bottom-up electrochemical method.
• To achieve and characterize lensing action with the fabricated material.

Main Methods:

• Fabrication of anisotropic metamaterial using nanowire array via electrochemical method.
• Experimental demonstration of negative refraction.
• Lensing action with a micron-thick slab.
• Near-field scanning optical microscopy (NSOM) for 3D beam mapping.

Main Results:

• Achieved negative refraction without requiring a negative phase index.
• Successfully fabricated a non-resonant bulk metamaterial.
• Demonstrated lensing action and imaging of a slit object.
• Detailed mapping of the focused light beam in 3D space using NSOM.

Conclusions:

• Anisotropic metamaterials can achieve negative refraction through mechanisms other than a negative phase index.
• Electrochemical fabrication offers a viable route for creating such bulk metamaterials.
• The demonstrated lensing capability highlights the potential of these metamaterials for optical applications.