Abstract
We present three phthalocyanine compounds as terahertz wave amplitude modulators. More than 99% modulation depth can be achieved by using external CW laser which under low power irradiation. Three phthalocyanine compounds are CuPc, AlClPc and SnCl2Pc. We used 2 mm-thick, high resistive Si films as substrates. Using thermal evaporation we deposited 200-nm thick film on the substrate, and without using thermally annealed. A 450nm CW semiconductor laser was used as the optical modulating source. The optical characteristics of these films in the THz range were investigated by using typical THz time-domain transmission spectroscopy, and with reliable 0.2-2.6 THz frequency range. The experimental result shows that THz wave amplitude modulation efficiency of the three films quickly increased by increasing external laser power. The result presents that AlClPc/Si and CuPc/Sifilms can achieve more than 99% modulation efficiency, and the SnCl2Pc/Si is 96.3%. Moreover, these modulation effects can be achieved by a relatively lower modulating laser power. For the AlClPc/Si film with the highest modulation efficiency, the external laser poweris 94.3mW, the corresponding intensity is 1.57×102mW/cm2.
© 2014 Optical Society of America
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