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Micromachines
Special Issues
Silicon Photonics and Other Integrated Photonic Platforms
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Silicon Photonics and Other Integrated Photonic Platforms

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 8193

Special Issue Editor

Prof. Dr. You-Chia Chang

E-Mail Website
Guest Editor
Department of Photonics and Institute of Electro-Optical Engineering, National Yang Ming Chiao Tung University (NYCU), Hsinchu 30010, Taiwan
Interests: silicon photonics; metasurfaces; metamaterials; two-dimensional materials

Special Issue Information

Dear Colleagues,

Silicon photonics is a leading platform for large-scale photonic integration. A large number of optical devices with different functionalities, including gratings, phase shifters, modulators, and detectors, can be manufactured monolithically to form photonic integrated circuits. Silicon photonics leverages the mature CMOS process to enable high-volume production capability while foundries continue to provide more advanced services and complete PDKs. Recent years have witnessed the growing applications of silicon photonics, including optical interconnects for data centers, LIDAR for autonomous vehicles, artificial neural networks, biomedical and chemical sensors, and quantum communications and computation. Integrated photonic platforms based on III-V semiconductors and nonlinear optical materials can provide functionalities beyond silicon photonics. These platforms enable light sources, gain media, strong modulation, and nonlinear optical phenomena on a chip-scale. Accordingly, this Special Issue seeks to showcase research papers, communications, and review articles that focus on: (1) novel passive and active photonic device designs; (2) applications of integrated photonics for communications, sensing, ranging, computing, imaging, and biophotonics; (3) packaging, optical I/O, and heterogeneous integration.

Prof. Dr. You-Chia Chang
Guest Editor

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. Micromachines 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

  • silicon photonics
  • integrated photonics
  • micro- and nanophotonic devices

Published Papers (2 papers)

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Research

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12 pages, 14963 KiB  
Article
Bidirectional Coupler Study for Chip-Based Spectral-Domain Optical Coherence Tomography
by Hong-Yan Zheng, Bo-Liang Chen, Hsiao-Yen Lu, Shih-Hsiang Hsu and Masanori Takabayashi
Micromachines 2022, 13(3), 373; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13030373 - 26 Feb 2022
Cited by 2 | Viewed by 1765
Abstract
A chip-based spectral-domain optical coherence tomography (SD-OCT) system consists of a broadband source, interferometer, and spectrometer. The optical power divider flatness in the interferometer’s wavelength is crucial to higher signal-to-noise ratios. A Mach–Zehnder directional coupler (MZDC) structure could be utilized to smoothly maximize [...] Read more.
A chip-based spectral-domain optical coherence tomography (SD-OCT) system consists of a broadband source, interferometer, and spectrometer. The optical power divider flatness in the interferometer’s wavelength is crucial to higher signal-to-noise ratios. A Mach–Zehnder directional coupler (MZDC) structure could be utilized to smoothly maximize the splitting ratio of 50:50 on a silicon platform, with a sub-micrometer of decoupler optical path difference insensitive to the process variation up to 20 nanometers. However, the optical signal reflected from the reference and sample will go back to the same interferometer MZDC. The so-called bidirectional coupler MZDC will not illustrate a flat optical power response in the operating wavelength range but could still demonstrate at least 20 dB signal-to-noise ratio improvement in OCT after the echelle grating spectrum compensation is applied. For maintaining the axial resolution and sensitivity, the echelle grating is also insensitive to process shifts such as MZDC and could be further utilized to compensate a 3 dB bidirectional MZDC structure for a broad and flat 100 nm wavelength response in the interferometer-based on-chip SD-OCT. Full article
(This article belongs to the Special Issue Silicon Photonics and Other Integrated Photonic Platforms)
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Review

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20 pages, 7242 KiB  
Review
Free-Space Applications of Silicon Photonics: A Review
by Chung-Yu Hsu, Gow-Zin Yiu and You-Chia Chang
Micromachines 2022, 13(7), 990; https://0-doi-org.brum.beds.ac.uk/10.3390/mi13070990 - 24 Jun 2022
Cited by 14 | Viewed by 5845
Abstract
Silicon photonics has recently expanded its applications to delivering free-space emissions for detecting or manipulating external objects. The most notable example is the silicon optical phased array, which can steer a free-space beam to achieve a chip-scale solid-state LiDAR. Other examples include free-space [...] Read more.
Silicon photonics has recently expanded its applications to delivering free-space emissions for detecting or manipulating external objects. The most notable example is the silicon optical phased array, which can steer a free-space beam to achieve a chip-scale solid-state LiDAR. Other examples include free-space optical communication, quantum photonics, imaging systems, and optogenetic probes. In contrast to the conventional optical system consisting of bulk optics, silicon photonics miniaturizes an optical system into a photonic chip with many functional waveguiding components. By leveraging the mature and monolithic CMOS process, silicon photonics enables high-volume production, scalability, reconfigurability, and parallelism. In this paper, we review the recent advances in beam steering technologies based on silicon photonics, including optical phased arrays, focal plane arrays, and dispersive grating diffraction. Various beam-shaping technologies for generating collimated, focused, Bessel, and vortex beams are also discussed. We conclude with an outlook of the promises and challenges for the free-space applications of silicon photonics. Full article
(This article belongs to the Special Issue Silicon Photonics and Other Integrated Photonic Platforms)
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