Broadband and wide-angle beam deflection enabled by reconfigurable meta-arrays

Area of Science:

• Metamaterials
• Nanophotonics
• Optical Engineering

Background:

• Metamaterials offer unique light manipulation capabilities.
• Phase-change materials provide dynamic control over optical properties.
• Efficient beam deflection is crucial for optical systems.

Purpose of the Study:

• To develop a simple, versatile reflective meta-array for broadband and wide-angle beam deflection.
• To investigate the performance of antimony trisulfide nanorods in phase-change optical devices.
• To explore multifunctional capabilities including spectral filtering and beam splitting.

Main Methods:

• Fabrication of a reflective meta-array using antimony trisulfide nanorods.
• Characterization of the meta-array's optical performance in amorphous and crystalline states.
• Measurement of deflection efficiency, passband width, and spectral characteristics.

Main Results:

• Achieved over 80% deflection efficiency with a 1000 nm passband in the amorphous state (O- to U-band).
• Demonstrated tunable efficiency (average 40%) and passband (800 nm over C-band) in the crystalline state.
• The device exhibited simultaneous spectral filtering and beam splitting functionalities.

Conclusions:

• The antimony trisulfide nanorod meta-array is a structurally simple yet functionally versatile device.
• The phase-change nature of Sb2S3 enables tunable optical performance for beam deflection.
• This multifunctional meta-array offers a compact solution for optical attenuation and beam manipulation.