Open AccessPolarization control by modulated photonic-crystal lasers
Author(s) -
Kyoko Kitamura,
Takashi Okino,
Daiki Yasuda,
Susumu Noda
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.004718
Subject(s) - optics , polarization (electrochemistry) , physics , laser , modulation (music) , photonic crystal , perpendicular , photonics , chemistry , geometry , mathematics , acoustics
Modulated photonic-crystal lasers can control the output beam direction two-dimensionally by exciting a two-dimensional cavity mode at the non-diffractive photonic band-edge and diffracting the mode upwards with position modulation of each air hole. In these lasers, the position modulation can be introduced one-directionally, where the modulation is given by the distances between the air holes, or two-directionally, where the modulation is given by the rotation angles of the air holes. For one-directional position modulation, we show that the polarization of output beams is perpendicular to the direction of modulation. For two-directional position modulation, we show that circularly polarized beams are obtained. As such, these lasers can control not only the beam direction but also the polarization.