Introduction Laser-driven ion acceleration is an emerging promising technology for generating high-energy proton beams in a compact and cost-effective manner. By utilizing intense laser pulses to interact with solid targets, it is possible to produce ion beams with energies suitable for various applications, including medical therapy, materials science, and imaging. Traditional flat-foil targets, while well-understood, face limitations in achieving higher proton energies and beam quality without increasing laser energy inputs.

Unmet Need Current laser-driven proton acceleration approaches require large laser systems and have yet to reach clinically relevant energies (around 250 MeV for proton therapy). Therefore, there is a need for scalable target designs that can optimize energy transfer, improve beam emission properties, and facilitate cascaded acceleration schemes without substantial increases in laser power.

Our Technology Our breakthrough involves the use of micrometric, transversely immersed bar targets (“μ-bars”) made of high-atomic-number materials like gold. These targets, with dimensions smaller than half the laser wavelength, harness the interaction of intense laser pulses to generate stronger electron sheath fields. This results in significantly enhanced proton acceleration, achieving energies exceeding 6 MeV with only 120 mJ of laser energy, three times the energy compared to conventional flat-foil targets. The μ-bar design enables efficient energy transfer, produces a small virtual source size for high-resolution imaging applications, and opens pathways for cascaded, multi-target acceleration schemes controlled by optical means. Numerical simulations further demonstrate potential for higher-energy, high-quality proton beams at reduced laser energies.

Potential Markets This innovative target technology has broad implications across multiple high-impact sectors:

• • Medical Therapy: Enabling compact, affordable proton therapy systems for cancer treatment, improving patient access and reducing costs.
  • Materials Science & Non-Destructive Testing: Providing high-resolution proton radiography and real-time imaging for research and industrial applications.
  • Security & Defense: Facilitating fast, portable neutron and ion sources for scanning and detection systems.

By enabling efficient, scalable, and high-energy ion beams with minimal laser power, this technology holds promise to revolutionize fields reliant on ion acceleration, offering a compact and versatile solution for tomorrow’s scientific and medical needs.