Dr. Cheng-Wei Chang Profile

Dr. Cheng-Wei Chang

at National Tsing Hua Univ

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Proceedings Article | 29 September 2017 Presentation

A three-dimensional negative index medium and a miniature surface plasmon polariton amplitude modulator (Conference Presentation)

Ta-Jen Yen, Chu-En Lin, Chih-Jen Yu, Tsung-Yu Huang, Ting-Tso Yeh, Cheng-Wei Chang

Proceedings Volume 10346, 103461X (2017) https://doi.org/10.1117/12.2277112

KEYWORDS: Plasmonics, Surface plasmon polaritons, Modulators, Gold, Modulation, Polarization, Split ring resonators, Terahertz radiation, Ultraviolet radiation, Lithography

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In this talk, I introduce two plasmonic devices. Firstly, we design and construct a three-dimensional (3D) negative index medium (NIM) composed of gold hemispherical shells to supplant an integration of a split-ring resonator and a discrete plasmonic wire for both negative permeability and permittivity at THz gap. With the proposed highly symmetric gold hemispherical shells, the negative index is preserved at multiple incident angles ranging from 0° to 85° for both TE and TM waves, which is further evidenced by negative phase flows in animated field distributions and outweighs conventional fishnet structures with operating frequency shifts when varying incident angles. Finally, the fabrication of the gold hemispherical shells is facilitated via standard UV lithographic and isotropic wet etching processes and characterized by -FTIR. The measurement results agree the simulated ones very well. Secondly, we present a miniature surface plasmon polariton amplitude modulator (SPPAM) by directing and interfering surface plasmon polaritons on a nanofabricated chip. Our results show that this SPPAM enables two kinds of modulations. The first kind of modulation is controlled by encoding angular-frequency difference from a Zeeman laser, with a beat frequency of 1.66 MHz; the second of modulation is validated by periodically varying the polarization states from a polarization generator, with rotation frequencies of 0.5-10k Hz. In addition, the normalized extinction ratio of our plasmonic structure reaches 100. Such miniaturized beat-frequency and polarization-controlled amplitude modulators open an avenue for the exploration of ultrasensitive nanosensors, nanocircuits, and other integrated nanophotonic devices.

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