Nonlocality-Enabled Pulse Management in Epsilon-Near-Zero Metamaterials

Area of Science:

• Photonics and Metamaterials
• Ultrafast Optics
• Nonlinear Optics

Background:

• Ultrashort optical pulses are crucial for scientific research and data communications.
• Controlling pulse characteristics, including propagation speed and dispersion, is a significant challenge.
• Metamaterials offer novel ways to engineer optical properties at the nanoscale.

Purpose of the Study:

• To demonstrate temporal pulse shaping using epsilon-near-zero (ENZ) metamaterials.
• To investigate the control of pulse propagation (subluminal, superluminal, backward) in nanoscale devices.
• To explore the application of metamaterials for dispersion management (DM) of ultrafast pulses.

Main Methods:

• Utilized an epsilon-near-zero (ENZ) metamaterial exhibiting strong nonlocal effects.
• Experimentally controlled pulse propagation by adjusting the angle of illumination.
• Analyzed the amplitude and phase control of 10 ps pulses via dispersion management.

Main Results:

• Demonstrated switching between subluminal, superluminal, and backward pulse propagation (±c/20) within the same metamaterial device.
• Achieved this control over a wide bandwidth of tens of THz.
• Showcased the ability to manage dispersion for precise control of pulse amplitude and phase.

Conclusions:

• Metamaterials provide a powerful platform for temporal pulse engineering at the nanoscale.
• Angle-controlled propagation switching in ENZ metamaterials offers a new method for ultrafast pulse manipulation.
• This technique has significant potential for applications in laser physics, optical communications, imaging, and spectroscopy.