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Plasmonic and metasurface structures offer unique optical features such as sub-wavelength field confinement, unusual optical nonlinear/quantum properties and wavefront shaping for advanced light manipulation and development of novel and ultracompact optical devices [1]. On the other hand, optical fiber is very efficient in transmitting light, however, its functionality is somewhat limited by the dielectric material of the core, which has poor electronic, magneto-optical, and nonlinear-optical responses and has the dielectric diffraction limit.
In this talk, I will review our recent research efforts on the study of “meta”-optical fiber by integrating metasurface and plasmonic nanostructures with optical fibers. I will discuss our development of novel and ultracompact in-fiber optical meta-devices such as an optical fiber color filter and metalens [2, 3]. I will also present the opportunity on using plasmonic nanowire probe on optical fiber for tip-enhanced Raman spectroscopy for bio/chemical sensing. These advanced “meta”-optical fibers open the path to revolutionary in-fiber optical imaging and sensing applications [4].
1. Y. W. Huang, H. W. Lee, R. Sokhoyan, R. Pala, K. Thyagarajan, S. Han, D. P. Tsai, and H. A. Atwater, “Gate-tunable conducting oxide metasurfaces,” Nano Lett. 16, 5319-5325 (2016).
2. J. Yang, I Ghirmire, P. C. Wu, S. Gurung, C. Arndt, D. P. Tsai, H. W. Lee, “Photonic crystal fiber metalens”, submitted (2018).
3. Indra Ghimire, Jingyi Yang, Sudip Gurung, Satyendra K. Mishra and Ho Wai Howard Lee,” Polarization dependent photonic crystal fiber color filter using asymmetric metasurfaces,” Submitted (2018)
4. K. Minn, A. Anopchenko, J. Yang, H. W. Lee, “Excitation of epsilon-near-zero resonance in ultra-thin indium tin oxide shell embedded nanostructured optical fiber,” Nature Scientific Reports 8, 2342 (2018).
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