Toward full spatiotemporal control on the nanoscale.

Area of Science:

• Optics and Photonics
• Nanotechnology
• Materials Science

Background:

• Coherent control of light fields is crucial for nanoscale applications.
• Surface plasmon polaritons (SPPs) offer unique light confinement properties.

Purpose of the Study:

• To demonstrate full coherent control of light fields on nanometer length scales.
• To develop a method for generating ultrashort, localized electromagnetic field pulses.

Main Methods:

• Utilizing spatiotemporal modulation of surface plasmon polariton (SPP) fields.
• Employing a nanowedge structure to guide and focus SPP wavepackets.
• Achieving adiabatic concentration of SPP fields at a nanofocus.

Main Results:

• Demonstrated complete coherent control over the focused waveform profile in space and time.
• Generated ultrashort pulses of local fields at the nanofocus.
• Successfully compressed and concentrated SPP wavepackets.

Conclusions:

• The proposed approach enables unprecedented coherent control of light at the nanoscale.
• This technique opens new avenues for ultrafast nanophotonics and quantum information processing.