Large second-harmonic response of C60 thin films

Abstract

Second harmonic generation measurements were performed using 1.064 μm pulses provided by a Nd:YAG laser. A bulk second‐order susceptibility χ⁽²⁾_{z, zz} = 2.1 × 10 ^{− 9} esu was observed at room temperature, which is about 1.5 times the χ⁽²⁾ value of quartz. χ⁽²⁾ values in a poling field were studied as a function of temperature; the largest value occurred at a nominal temperature of 140 °C where χ⁽²⁾ is ten times larger than the room temperature value.