W-band phase shifter based on optimized optically controlled carbon nanotube layer

QC 20171117
Phase shifting in a dielectric rod waveguide (DRW), loaded with carbon nanotube (CNT) layers of different thickness, was studied experimentally under light illumination in the frequency range of 75-110 GHz. The dependence of efficiency of the phase shifting, in terms of phase shift per light intensity and millimeter wave attenuation, on the optical transparency of the CNT-layer is investigated in this paper. The best result, a phase shifter of 0-15° with less than 0.1 dB additional signal loss in the W-band was achieved for a 95% transparent CNT layer at 23 mW/mm2 light intensity of a tungsten halogen lamp (main radiation spectrum is 550-680 nm). The overall insertion loss of the phase shifter including two DRW tapering sections serving as transitions to rectangular waveguides are 3 to 5 dB in the W-band, about 2 dB is attributed to the CNT DRW section. This comprises, for the first time, an optically-controlled CNT-based DRW phase shifter with phase shift and insertion loss levels suitable for practical applications.

Anoshkin, IlyaKTH,Mikro- och nanosystemteknik(Swepub:kth)u1zzhikx (författare)
Nefedova, I. I. (författare)
Oberhammer, Joachim,ProfessorKTH,Mikro- och nanosystemteknik(Swepub:kth)u12600dy (författare)
Raisanen, A. V. (författare)
KTHMikro- och nanosystemteknik (creator_code:org_t)

Ingår i:2017 IEEE MTT-S International Microwave Symposium (IMS): Institute of Electrical and Electronics Engineers (IEEE), s. 1188-11919781509063604

Av författaren/redakt...: Lioubtchenko, Dm ...; Anoshkin, Ilya; Nefedova, I. I.; Oberhammer, Joac ...; Raisanen, A. V.

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