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Light Coupling and Modulation in Coupled Nanowire Ring−Fabry-Pérot Cavity

2009; American Chemical Society; Volume: 9; Issue: 7 Linguagem: Inglês

10.1021/nl901190v

1530-6992

Ren‐Min Ma, Xianlong Wei, Lun Dai, Shifeng Liu, Ting Chen, Song Yue, Zhi Li, Qing Chen, G. G. Qin,

Photonic Crystals and Applications

CdS nanowire (NW) ring cavities were fabricated and studied for the first time. The rings with radii from 2.1 to 5.9 μm were fabricated by a nanoprobe system installed in a scanning electron microscope. Radius dependent whispering gallery modes (WGMs) were observed. A straight CdS NW with Fabry-Pérot (F-P) cavity structure was fabricated and placed by the side of a NW ring cavity to form a coupled ring−F-P cavity. When the NW ring was excited by a focused laser, a bright green light spot was observed at the output end of the straight NW, indicating that the latter had served as an effect waveguide to couple the light out from the ring cavity. The corresponding light spectrum showed that the WGMs had been modulated. We confirmed that the NW F-P cavity had served as a modulator. Such a coupled cavity has potential application in a nanophotonic system.