Abstract-Characteristics of terahertz wave modulation using wavelength-selective photoexcitation in pentacene/Si and TIPS pentacene/Si bilayers

Hyung Keun Yoo1, Chul Kang2, Chul-Sik Kee2, In-Wook Hwang2,a) and Joong Wook Lee3,b)
http://scitation.aip.org/content/aip/journal/adva/6/11/10.1063/1.4967781?TRACK=RSS
1 S. LSI Metrology & Inspection, Samsung Electronics, Yongin 17113, South Korea
2 Advanced Photonics Research Institute, GIST, Gwangju 500-712, South Korea
3 Department of Physics and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 500-757, South Korea
a) Email: hwangiw@gist.ac.kr;
b) Email: leejujc@chonnam.ac.kr
AIP Advances 6, 115310 (2016); http://dx.doi.org/10.1063/1.4967781

We demonstrate the characteristics of the optical control of terahertz (THz) wave transmission in photoexcited bilayers of pentacene/Si and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene)/Si. The modulation efficiency is influenced significantly by the photoexcitation wavelength of the optical beams. Lower optical absorption of organic materials leads to higher modulation efficiency because the photocarriers excited on Si with a higher diffusion rate and mobility are far more instrumental in increasing the modulation than the excitons generated on the organic layers. Securing a sufficient depth for carrier diffusion on organic layers is also important for increasing the THz modulation efficiency. These findings may be useful for designing highly efficient and spectrally controllable THz wavemodulators.