期刊
ACS PHOTONICS
卷 4, 期 6, 页码 1494-1500出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b00278
关键词
indium oxide; transparent semiconducting oxide; negative optical nonlinearity; transient; ultrafast; full-visible range
类别
资金
- Center for Nanoscale Materials, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility [DE-AC02-06CH11357]
- MRSEC Program at Northwestern University [NSF DMR-1121262]
Dynamic control of the optical response of materials at visible wavelengths is key to future metamaterials and photonic integrated circuits. Materials such as transparent conducting oxides have attracted significant attention due to their large optical nonlinearity under resonant optical pumping condition. However, optical nonlinearities of TCOs are positive in sign and are mostly in the epsilon-near-zero to metallic range where materials can become lossy. Here we demonstrate large amplitude, negative optical nonlinearity (Delta n from -0.05 to -0.09) of indium oxide nanorod arrays in the full-visible range where the material is transparent. We experimentally quantify and theoretically calculate the optical nonlinearity, which arises from a strong modification of interband optical transitions. The approach toward negative optical nonlinearity can be generalized to other transparent semiconducting oxides and opens door to reconfigurable, subwavelength optical components.
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