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Volume 47, Issue 7
Special Issue on Functional Artificial Structures for Controlling Optical Properties
Displaying 1-8 of 8 articles from this issue
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Special Issue on Functional Artificial Structures for Controlling Optical Properties
Special Issue
Laser Review
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Ikufumi KATAYAMA2019 Volume 47 Issue 7 Pages 344-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSDesirable control of optical properties in materials using artificial structures have been explored for decades since the development of nano- and micro fabrication techniques. While photonic crystals and plasmonics are the examples of such an approach, new concepts for designing the optically functional structures are recently arising to show remarkable optical properties that were not accessible before. In this special issue, recent advancements in these new artificial optical materials ranging from topological photonics to exotic phase change materials are reviewed, focusing on their designing strategy and applications.View full abstractDownload PDF (370K) -
Xiao HU2019 Volume 47 Issue 7 Pages 346-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSWe present a theory for achieving a photonic analogue of the quantum spin Hall state of electrons in terms of a honeycomb dielectric photonic crystal where the orbital angular momentum behaves as an emergent pseudospin degree of freedom. We show that deforming the honeycomb lattice in the way respecting C6v lattice symmetry opens a frequency bandgap in the Dirac-like photonic dispersion accompanied by a band inversion between the p orbital and d orbital, yielding the nontrivial photonic topology. Experimentally we visualize the interface microwave transports between a topological photonic crystal and a topologically trivial one both made of Al2O3, which are immune to backscattering and robust to crystal imperfections and disorder. As only conventional dielectric materials and local real-space manipulations are required, the present scheme can be extended to visible lights to inspire many future applications in the field of photonics and beyond.View full abstractDownload PDF (1458K) -
Satoshi IWAMOTO,, Yasutomo OTA, Yasuhiko ARAKAWA2019 Volume 47 Issue 7 Pages 351-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSTopological photonics, an emerging field in photonics, attracts many researchers not only due to its fundamental interests, but also due to its potential applications. Introducing the concept of band topology into photonic systems enables the realization of various topological states of light. Photonic crystals (PhCs) are an important platform for the study of topological photonics, particular for integrated photonic circuits. Topologically protected edge states, which function as optical waveguides enabling robust light transport, have been intensively studied. Meanwhile, optical cavities are another key component in integrated photonic systems. Here, we will discuss an optical nanocavity realized using the semiconductor PhC platform. We designed two topologically distinct PhC nanobeams and experimentally demonstrated lasing oscillation using a topological localized mode at the interface between them.View full abstractDownload PDF (1254K) -
Kuniaki KONISHI, Haruyuki SAKURAI, Junji YUMOTO, Makoto KUWATA-GON ...2019 Volume 47 Issue 7 Pages 356-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSTerahertz waves corresponding to the frequency range of 0.1 to 10 THz are used as a tool not only for measuring physical properties, but also for sensing and communication technology in recent years. Three-dimensional artificial structures having various optical functions have the possibility to realize versatile terahertz wave control. However, conventional fabrication techniques typified by lithography are difficult to apply in producing three-dimensional structures with a size of about a terahertz wavelength. In this research, we demonstrate that it is possible to fabricate terahertz optics by utilizing femtosecond laser processing and 3D printing as new three-dimensional artificial structure fabrication technologies. By using each technology, a terahertz anti-reflecting structure and a terahertz high-pass filter were fabricated and their outstanding characteristics were confirmed using terahertz time-domain spectroscopy.View full abstractDownload PDF (1393K) -
Yoshiaki NISHIJIMA2019 Volume 47 Issue 7 Pages 361-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSRecently, energy harvesting from environments (solar, geothermal, vibrational, wind) are focused for realizing sensor networks, which is the key technology for Internet of things (IoT) world. Here we demonstrate the review of various kinds of anti-reflective surfaces and perfect absorbers made by semiconductors and plasmonic metasurfaces for energy harvesting materials.View full abstractDownload PDF (1109K) -
Satoshi ISHII, Satish L SHINDE, Manpreet KAUR, Ramu Pasupathi SUGA ...2019 Volume 47 Issue 7 Pages 365-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSPhoto-excitation of hot carriers in metallic nanostructures have been applied to various photoelectric conversions to harvest low-energy photons. The relaxed hot carriers become heat where the heated areas are limited to the surrounding of the metallic nanostructures, leading to indirect local heating. In contrast to the research on photoelectric and photothermal conversions using metals, our recent works have shown that transition metal nitrides and transition meal carbides can be alternative to metals. These materials are cost-effective and out-perform gold that has been used in most of the past studies. In the current articles, we briefly review our current photoelectric and photothermal conversions using transition metal nitrides and transition meal carbides and discuss the future direction.View full abstractDownload PDF (1248K) -
Kotaro MAKINO,, Kosaku KATO, Junji TOMINAGA, Makoto NAKAJIMA, Taka ...2019 Volume 47 Issue 7 Pages 370-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSPhase change materials are promising for various kind of photonics applications as well as optical and electrical memories. Among them, artificially designed GeTe/Sb2Te3 interfacial phase change materials (iPCMs) have a potential impact on terahertz photonics since iPCM can be a topological material depending on its multi-layered structure and have unique electronic properties different from conventional alloy phase change materials. Here, we report on our recent studies including iPCM-based terahertz detection device, characterization of the multilayered structure by terahertz generation measurements, and formation of laser induced periodic surface structure (LIPSS) fabricated on a Ge2Sb2Te alloy film by a intense pulse train derived from a free electron laser.View full abstractDownload PDF (1389K) -
Ryo KIKKAWA, Keisuke GODA, Daiki UEYAMA, Munehiro NISHIDA, Yutaka ...2019 Volume 47 Issue 7 Pages 375-
Published: 2019
Released on J-STAGE: August 13, 2021
JOURNAL FREE ACCESSWe theoretically investigated the enhancement of light intensity in a semiconductor near the surface by metal gratings with a coupled-mode method, focusing on the enhancement under the metal opening (slit). Although the enhancement peaks at the Fabry-Perot resonance wavelengths, dark lines appear in it under the slit at wavelengths slightly longer than the diffraction’s onset called the Rayleigh wavelength. By inspecting the reflection coefficient at the slit’s exit interface, we clarified that the disappearance of the enhancement is caused by the boundary conditions at the interface and is a general feature of metal gratings.View full abstractDownload PDF (1196K)
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