Subterahertz Photonic Crystal Klystron Amplifier

Jacob Stephens, G. Rosenzweig, M. A. Shapiro, R. J. Temkin, J. C. Tucek, K. E. Kreischer

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This Letter reports the successful experimental demonstration of amplification of subterahertz radiation in a klystron with photonic crystal cavities. The klystron has six cavities, with each cavity having a series of oversized photonic crystal cells made up of a 5×3 array of square posts. The center post is removed from each cell to form a highly oversized (0.8 mm∼λ/4) beam tunnel, with power coupling from cell to cell through the tunnel. The pulsed electron beam is operated at 23.5 kV, 330 mA in a 0.5 T solenoidal field. At 93.7 GHz, a small-signal gain of 26 dB and a saturated output power of 30 W are obtained. Experimental results are in very good agreement with the predictions of a particle-in-cell code. The successful achievement of high gain operation of a photonic crystal klystron amplifier is promising for the future extension of klystron operation well into the terahertz frequency region.

Original languageEnglish
Article number244801
Pages (from-to)244801
JournalPhysical Review Letters
Issue number24
StatePublished - Dec 12 2019


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