Chirp-driven control over fast-slow light effects in epsilon-near-zero metamaterials

Area of Science:

• Photonics and Metamaterials
• Nonlinear Optics
• Quantum Optics

Background:

• Metamaterials offer tunable dispersion for optical applications.
• Fast and slow light effects are crucial for advanced optical devices.
• Epsilon-near-zero (ENZ) metamaterials exhibit unique optical nonlocality.

Purpose of the Study:

• To demonstrate control over fast and slow light phenomena in ENZ metamaterials.
• To investigate the role of optical nonlocality and laser chirp in manipulating light propagation.
• To achieve switching between fast and slow light effects by tuning experimental parameters.

Main Methods:

• Utilizing metal nanorod-based ENZ metamaterials.
• Employing femtosecond laser pulses with controlled chirp.
• Varying the angle of incidence and central wavelength of the laser pulses.
• Analyzing light propagation dynamics near the metamaterial's zero-transmission regime.

Main Results:

• Demonstrated switching between fast and slow light phenomena.
• Showcased control via angle of incidence and laser pulse central wavelength.
• Confirmed the enhancement of fast-slow light effects by laser chirp.
• Leveraged the optical nonlocality of ENZ metamaterials for precise manipulation.

Conclusions:

• Femtosecond laser chirp and ENZ metamaterial nonlocality enable unprecedented control over light propagation.
• Tunable switching between fast and slow light is achievable by modifying incidence angle or laser parameters.
• This work provides a pathway for novel optical devices utilizing engineered light-matter interactions.