an experiment for the measurement of the dynamical Casimir effect

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Surface effective motion IIGenerate periodic motion by placing the reflecting surface intwo distinct positions alternativelyPosition 1 - metallic platePosition 2 - microwave mirror with driven reflectivityMetalplateVariablemirrorMicrowaveUSEP1 P2Semiconductors under illumination can change their dielectric properties and becomefrom completely transparent to completely reflective for microwaves.Light with photon energyhν > E band gap of semiconductorEnhances electron density in the conduction bandLaser ON - OFFOn semiconductorTime variable mirrorGiuseppe Ruoso - Les Houches - June 9, 2005
MIR - the experimental schemeA semiconductor layer (thickness ~ 1 mm)is placed on one end of a niobium superconductingcavity. Cavity resonance ν r.Using an amplitude modulated (at frequencyf) laser light the semiconductorswitches from transparency to reflection,thus producing an effective motion.whenf = 2 ν rPhotons will be produced in the vacuumand will be picked-up by the antennaWith this set-up the amplitude ofthe motion in very large, thusproviding a large effective velocityΔT = 100 psT = 1 µs..n = 1 , 2 , 3 , 4, ... . , 10 3P las = 10 nJ/100 psGiuseppe Ruoso - Les Houches - June 9, 2005
Page 9 and 10: Surface mechanical motionStrong lim
Page 11: Surface effective motionVan der Wal
Page 15 and 16: Semiconductor as a reflectorReflect
Page 17 and 18: Cavity with semiconductor wallCompu
Page 19 and 20: Detection electronics 2• Performe
Page 21 and 22: Detailed set-upWorking temperature4
Page 23 and 24: Giuseppe Ruoso - Les Houches - June
Page 25 and 26: Check listSeveral things can be emp

an experiment for the measurement of the dynamical Casimir effect

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