Comparison of charge and field driven optical modulators (Conference Presentation)

Jacob B. Khurgin

doi:10.1117/12.2632735

3 October 2022 Comparison of charge and field driven optical modulators (Conference Presentation)

Jacob B. Khurgin

Proceedings Volume PC12195, Metamaterials, Metadevices, and Metasystems 2022; PC121951G (2022) https://doi.org/10.1117/12.2632735
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

Electro optic modulators being key for many signal processing systems must adhere to requirements given by both electrical and optical constrains. Distinguishing between charge driven (CD) and field driven (FD) designs, we ask whether fundamental performance benefits can be claimed of modulators based on emerging electro-optic materials. Following primary metrics, we compare the performance of emerging electro-optic and electro-absorption modulators such as graphene, transparent conductive oxides, and Si, based on charge injection with that of the ‘legacy’ FD modulators, such as those based on lithium niobate and quantum confined Stark effect. We show that for rather fundamental reasons, FD modulators always outperform CD ones in the conventional wavelength scale waveguides. However, for waveguide featuring a sub-wavelength optical mode, such as those assisted by plasmonics, the emerging CD devices are indeed highly competitive.

Conference Presentation

Citation Download Citation

Jacob B. Khurgin "Comparison of charge and field driven optical modulators (Conference Presentation)", Proc. SPIE PC12195, Metamaterials, Metadevices, and Metasystems 2022, PC121951G (3 October 2022); https://doi.org/10.1117/12.2632735

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KEYWORDS

Modulators

Optical modulators

Electro optics

Electrooptic modulators

Waveguides

Lithium niobate

Oxides

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