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Review

Modal Properties of Photonic Crystal Cavities and Applications to Lasers

1
DTU Fotonik, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
2
NanoPhoton—Center for Nanophotonics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
3
Department of Electronics and Telecommunications, Politecnico di Torino, IT-10129 Turin, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Bruno Romeira
Nanomaterials 2021, 11(11), 3030; https://doi.org/10.3390/nano11113030
Received: 8 October 2021 / Revised: 2 November 2021 / Accepted: 3 November 2021 / Published: 12 November 2021
(This article belongs to the Special Issue Semiconductor and Nanophotonic Devices)
Photonic crystal cavities enable strong light–matter interactions, with numerous applications, such as ultra-small and energy-efficient semiconductor lasers, enhanced nonlinearities and single-photon sources. This paper reviews the properties of the modes of photonic crystal cavities, with a special focus on line-defect cavities. In particular, it is shown how the fundamental resonant mode in line-defect cavities gradually turns from Fabry–Perot-like to distributed-feedback-like with increasing cavity size. This peculiar behavior is directly traced back to the properties of the guided Bloch modes. Photonic crystal cavities based on Fano interference are also covered. This type of cavity is realized through coupling of a line-defect waveguide with an adjacent nanocavity, with applications to Fano lasers and optical switches. Finally, emerging cavities for extreme dielectric confinement are covered. These cavities promise extremely strong light–matter interactions by realizing deep sub-wavelength mode size while keeping a high quality factor. View Full-Text
Keywords: photonic crystal(s); extreme dielectric confinement; light–matter interaction; line-defect cavities; nanolaser; microlaser; Bloch modes; Fano laser photonic crystal(s); extreme dielectric confinement; light–matter interaction; line-defect cavities; nanolaser; microlaser; Bloch modes; Fano laser
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MDPI and ACS Style

Saldutti, M.; Xiong, M.; Dimopoulos, E.; Yu, Y.; Gioannini, M.; Mørk, J. Modal Properties of Photonic Crystal Cavities and Applications to Lasers. Nanomaterials 2021, 11, 3030. https://doi.org/10.3390/nano11113030

AMA Style

Saldutti M, Xiong M, Dimopoulos E, Yu Y, Gioannini M, Mørk J. Modal Properties of Photonic Crystal Cavities and Applications to Lasers. Nanomaterials. 2021; 11(11):3030. https://doi.org/10.3390/nano11113030

Chicago/Turabian Style

Saldutti, Marco, Meng Xiong, Evangelos Dimopoulos, Yi Yu, Mariangela Gioannini, and Jesper Mørk. 2021. "Modal Properties of Photonic Crystal Cavities and Applications to Lasers" Nanomaterials 11, no. 11: 3030. https://doi.org/10.3390/nano11113030

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