Patent
Radial bragg ring resonator
Jacob Scheuer,Amnon Yariv +1 more
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TLDR
In this paper, a closed loop resonator with a distributed Bragg reflector is proposed to confine the light within the guiding core, which can be used in various applications such as optical filters, lasers, modulators, spectrum analyzers, wavelockers, interleave filters, and optical add drop multiplexers.Abstract:
A resonator structure is presented comprising a closed loop resonator having a distributed Bragg reflector for confining the light within the guiding core. In one embodiment the light is confined from both the internal and the external sides of the device forming a guiding channel (defect) or just by the external side forming a disk resonator. Although the perfectly circular shape is generally preferred, the resonator could be of any closed loop shape such as an ellipse, etc. Although not mentioned explicitly throughout the text, the Bragg reflectors can of any type of distributed reflector such as, for example, a photonic bandgap crystal where the Bragg reflector is constructed by series of holes in a dielectric material. The resonator structure can be used in various applications, such as optical filters, lasers, modulators, spectrum analyzers, wavelockers, interleave filters, and optical add drop multiplexers.read more
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References
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Journal ArticleDOI
Single-mode behavior of a circular grating for potential disk-shaped DFB lasers
TL;DR: In this article, the reflectivity and resonance condition of a circular grating for a disk-shaped distributed feedback (DFB) laser were calculated and the periodicity and position of the grating were chosen so that all reflections from each refractive index step were superimposed in-phase so as to be consistent with the resonant behavior of the fundamental mode wave.
Journal ArticleDOI
High-finesse disk microcavity based on a circular Bragg reflector
D. Labilloy,Henri Benisty,Claude Weisbuch,Thomas F. Krauss,Caleb Smith,Romuald Houdré,Ursula Oesterle +6 more
TL;DR: In this article, the authors made disk-shaped microcavities of approximately 10μm2 in area in a GaAs/AlGaAs waveguide structure by etching deep vertical concentric trenches.
Patent
Hyperresolution optical system
Yoshida Toshihiko,Osamu Yamamoto,Saburo Yamamoto,Shohichi Kato,Masumi Nakamichi,Toshimasa Hamada,Sadayoshi Matsui +6 more
TL;DR: In this article, a hyper-resolution optical device which can focus a beam of light to a diameter less than the diffraction limit is proposed, which is suitable for optical pick-up devices, laser printers, sensors.
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Circular grating lasers
Chun-Meng Wu,Toshihiko Makino +1 more
TL;DR: A surface emitting, circular grating, semiconductor laser is described in this paper, where gain is generated by injecting current into an active, annular mesa region which surrounds a central, circular region having a circular grated for surface emission.
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Optical disk apparatus for recording and reproducing ultra-high density signals
TL;DR: In this paper, an optical disc apparatus includes an optical disk which satisfies the relationship of QU1, where A s, φ s are the amplitude reflectivity ratio and the phase difference between the regions within and out of a signal mark (27, 28) on a signal surface (16) of the optical disc, D s is the area of the signal mark and λ is the wavelength of a light source (8), and the light reflected from signal surface is input-coupled by a grating coupler (4A, 4B) into a wave