Radiofrequency Postdoctoral Researcher

Radio frequency Postdoctoral Researcher – Physics World

Location: Physics World (unspecified location)

We invite you to join Lawrence Livermore National Laboratory (LLNL), where we enhance U.S. security through research and development. Our mission is to foster a culture that values individuals, teamwork, and diverse perspectives, and to achieve success via innovative solutions.

$117,900 – $135,060 per year (range based on experience and qualifications).

We have an opening for a Postdoctoral Researcher specializing in epitaxial growth and semiconductor devices. The role supports work in pulsed power, high‑power microwaves, and power electronics in the Materials Engineering Division, within LLNL's Engineering Directorate. Full‑time on‑site presence is required.

• Conduct research in the development of radio frequency and pulsed power systems.
• Design, build, and test RF devices and components such as transistors, amplifiers, circulators, antennas, nonlinear transmission lines, and oscillators.
• Collaborate closely with engineers, technicians, and integration experts to meet project goals.
• Publish research in peer‑reviewed journals and present at conferences, seminars, and technical meetings.
• Advance independent research interests and engage with internal and external scientists.
• Ensure all work follows ES&H, security, and business practice requirements and policies.
• Perform other duties as assigned.

• U.S. DOE Q‑level security clearance, requiring U.S. citizenship.
• Ph.D. in Electrical Engineering, Physics, or related field.
• Significant experience designing RF devices using CST, HFSS, Comsol, ADS, or Ansys.
• Experience in device characterization, antenna measurements, RF characterization, or microfabrication.
• Programming ability with MATLAB, Python, LabVIEW for data collection and analysis.
• Strong experimental design, measurement, and data acquisition skills.
• Track record of publishing peer‑reviewed literature.
• Initiative, interpersonal skills, and ability to succeed in a multidisciplinary team.
• Excellent verbal and written communication skills.

This is a post‑doctoral appointment with a 3‑year maximum. Candidates should have received their Ph.D. before hire.

• Listed as one of the Best Places to Work by Glassdoor (2025).
• Flexible benefits package.
• 401(k) plan.
• Relocation assistance.
• Education reimbursement program.
• Flexible schedules based on project needs.

The role requires a DOE Q‑level clearance. A federal background investigation will be initiated to confirm eligibility for classified information access. All Q‑cleared employees are subject to random drug testing.

External applicants must pass a post‑offer, pre‑employment drug test, including testing for marijuana in accordance with federal law.

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