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Crystals
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Photonic Crystal Lasers
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Photonic Crystal Lasers

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 4925

Special Issue Editors

Dr. Mingchu Tang

E-Mail Website
Guest Editor
Department of Electronic and Electrical Engineering, University College London, London WC1E 6BT, UK
Interests: molecular beam epitaxy; quantum dots; silicon photonics
Dr. Taojie Zhou

E-Mail Website
Guest Editor
School of Science and Engineering and Shenzhen Key Lab of Semiconductor Lasers, The Chinese University of Hong Kong, Shenzhen 518172, China
Interests: microcavity laser; micro resonator
Prof. Dr. Chaoyuan Jin

E-Mail Website
Guest Editor
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Interests: ultrafast photonics; semiconductor optoelectronics; integrated micro/nano photonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Photonic crystal lasers with three-dimensional, two-dimensional, and one-dimensional structure have grown in huge interest recently, due to the unique properties of low threshold, enhanced light–matter interaction because of the tight localization of the electromagnetic field. Moreover, photonic crystal surface emitting lasers are a great candidate as light sources in data-communication systems. This Special Issue focuses on the most advanced studies of laser devices with photonic crystal cavities and their related applications, though the scope of this Special Issue is not limited to them. We encourage authors to contribute your latest research results in the field.

Dr. Mingchu Tang
Dr. Taojie Zhou
Prof. Dr. Chao-Yuan Jin
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Photonic crystal
  • Microcavity
  • Nanophotonics
  • Semiconductor Lasers
  • Photonics

Published Papers (2 papers)

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Research

9 pages, 1212 KiB  
Article
Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers
by Praveen K. J. Singaravelu, Sharon M. Butler, Robert N. Sheehan, Alexandros A. Liles, Stephen P. Hegarty and Liam O’Faolain
Crystals 2021, 11(8), 848; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11080848 - 22 Jul 2021
Viewed by 2228
Abstract
We present a design methodology for hybrid lasers to realise mode-hop free operation by controlling the cavity mode spacing. In this study, a compact hybrid photonic crystal laser (H-PhCL) was employed which allowed a reduction of the Fabry–Perot length of the laser cavity [...] Read more.
We present a design methodology for hybrid lasers to realise mode-hop free operation by controlling the cavity mode spacing. In this study, a compact hybrid photonic crystal laser (H-PhCL) was employed which allowed a reduction of the Fabry–Perot length of the laser cavity and eliminated the need for an active mode stabilisation mechanism in order to realise mode-hop free operation. The H-PhCL was formed by butt-coupling a reflective semiconductor optical amplifier (RSOA) with a two-dimensional silicon (Si) photonic crystal (PhC) cavity. Continuous stable single frequency operation with >40 dB side-mode suppression ratio (SMSR) of the laser was achieved for gain currents of up to 100 mA, i.e., up to four times the threshold current. The shorter length of the laser cavity enabled single frequency operation due to the selection of a single longitudinal mode by the PhC narrowband reflector. Various longitudinal mode spacing regimes were studied to explain the mode-hop free characteristics of the H-PhCL. The proposed hybrid laser design methodologies can be adapted to eliminate mode-hopping in laser wavelength. Full article
(This article belongs to the Special Issue Photonic Crystal Lasers)
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12 pages, 26204 KiB  
Article
A Nanoscale Photonic Crystal Cavity Optomechanical System for Ultrasensitive Motion Sensing
by Ji Xia, Fuyin Wang, Chunyan Cao, Zhengliang Hu, Heng Yang and Shuidong Xiong
Crystals 2021, 11(5), 462; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst11050462 - 21 Apr 2021
Cited by 2 | Viewed by 2174
Abstract
Optomechanical nanocavities open a new hybrid platform such that the interaction between an optical cavity and mechanical oscillator can be achieved on a nanophotonic scale. Owing to attractive advantages such as ultrasmall mass, high optical quality, small mode volume and flexible mechanics, a [...] Read more.
Optomechanical nanocavities open a new hybrid platform such that the interaction between an optical cavity and mechanical oscillator can be achieved on a nanophotonic scale. Owing to attractive advantages such as ultrasmall mass, high optical quality, small mode volume and flexible mechanics, a pair of coupled photonic crystal nanobeam (PCN) cavities are utilized in this paper to establish an optomechanical nanosystem, thus enabling strong optomechanical coupling effects. In coupled PCN cavities, one nanobeam with a mass meff~3 pg works as an in-plane movable mechanical oscillator at a fundamental frequency of πΩm/2π=4.148 MHz. The other nanobeam couples light to excite optical fundamental supermodes at 1542.858 and 1554.464 nm with a Qo larger than 4 × 104. Because of the optomechanical backaction arising from an optical force, abundant optomechanical phenomena in the unresolved sideband are observed in the movable nanobeam. Moreover, benefiting from the in-plane movement of the flexible nanobeam, we achieved a maximum displacement of the movable nanobeam as 1468 fm/Hz1/2. These characteristics indicate that this optomechanical nanocavity is capable of ultrasensitive motion measurements. Full article
(This article belongs to the Special Issue Photonic Crystal Lasers)
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