Electrooptic Modulation

Wakita, Koichi

doi:10.1007/978-1-4615-6071-5_3

Semiconductor Optical Modulators 1998

DOI: 10.1007/978-1-4615-6071-5_3

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Electrooptic Modulation

Koichi Wakita¹

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2020

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“…Based on the above-discussed stimuli to modulate optical constants, optical modulators can be classified as all-optical, EO, magneto-optic, acousto-optic, and mechano-optical modulators and so on. , Among them, EO modulators are the most promising due to the simplicity of applying voltages to microfabricated electrodes and ability to minimize parasitic circuit elements. The performance of EO modulators strongly depends on the EO effect of component materials . This is especially important in the telecommunication region (1.3–1.5 μm), which represents the loss minima in the spectrum of optical fibers.…”

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confidence: 99%

Giant Gate-Tunability of Complex Refractive Index in Semiconducting Carbon Nanotubes

et al. 2020

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Electrically-tunable optical properties in materials are desirable for many applications ranging from displays to lasing and optical communication. In most two-dimensional thin-films and other quantum confined materials, these constants have been measured accurately. However, the optical constants of single walled carbon nanotube (SWCNTs) as a function of electrostatic tuning are yet to be measured due to lack of electronic purity and spatial homogeneity over large areas. Here, we measure the basic optical constants of ultrathin high-purity (>99%) -2 -semiconducting single wall carbon nanotube (s-SWCNT) films with spectroscopic ellipsometry. We extract the gate-tunable complex refractive index of s-SWCNT films and observe giant modulation of the real refractive index (~11.2% or an absolute value of > 0.2) and extinction coefficient (~11.6%) in the near-infrared (IR) region (1.3-1.55 μm) induced by the applied electric field significantly higher than all existing electro-optic semiconductors in this wavelength range. We further design a multilayer IR reflection phase modulator stack by combining s-SWCNT and monolayer MoS2 heterostructures that can attain >45° reflection phase modulation at 1600 nm wavelength for < 200 nm total stack thickness. Our results highlight s-SWCNTs as a promising material system for infrared photonics and electro-optics in telecommunication applications.

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Giant Gate-Tunability of Complex Refractive Index in Semiconducting Carbon Nanotubes

et al. 2020

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Electrooptic Modulation

Cited by 1 publication

References 50 publications

Giant Gate-Tunability of Complex Refractive Index in Semiconducting Carbon Nanotubes

Giant Gate-Tunability of Complex Refractive Index in Semiconducting Carbon Nanotubes

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