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Two-dimensional photonic crystal surface-emitting laser

外国特許コード F170009045
整理番号 AE02P005US
掲載日 2017年4月26日
出願国 アメリカ合衆国
出願番号 201615050993
公報番号 20160248224
公報番号 9627850
出願日 平成28年2月23日(2016.2.23)
公報発行日 平成28年8月25日(2016.8.25)
公報発行日 平成29年4月18日(2017.4.18)
国際出願番号 JP2014054429
国際公開番号 WO2014136607
国際出願日 平成26年2月25日(2014.2.25)
国際公開日 平成26年9月12日(2014.9.12)
優先権データ
  • 特願2013-046564 (2013.3.8) JP
  • 2014WO-JP54429 (2014.2.25) WO
  • 2015US-14773584 (2015.9.8) US
発明の名称 (英語) Two-dimensional photonic crystal surface-emitting laser
発明の概要(英語) (US9627850)
A two-dimensional photonic crystal surface emitting laser has a laminated structure including: a two-dimensional photonic crystal (2DPC) layer in which refractive index distribution is formed by two-dimensionally arranging air holes in a plate-shaped base member; and an active layer for generating light with wavelength λL by receiving an injection of electric current.
The two-dimensional photonic crystal surface emitting laser emits a laser beam in the direction of an inclination angle θ from normal to the 2DPC layer.
特許請求の範囲(英語) [claim1]
1. A two-dimensional photonic crystal surface emitting laser comprising a laminated structure including: an active layer for generating light having a wavelength lambda L by receiving an injection of an electric current; and
a two-dimensional photonic crystal layer in which refractive index distribution is formed by a plurality of modified refractive index regions two-dimensionally arranged in a plate-shaped base member, where a refractive index of the modified refractive index regions differs from that of the base member,
the two-dimensional photonic crystal surface emitting laser emitting a laser beam from an in-plane position (x, y) in the two-dimensional photonic crystal layer in a direction of: an inclination angle theta (x, y) from a normal to the two-dimensional photonic crystal layer; and an azimuthal angle phi (x, y) from a reference line that extends in an x-axis direction at the in-plane position in the two-dimensional photonic crystal layer, wherein
each of the modified refractive index region in the two-dimensional photonic crystal layer is modulated at respective lattice point of a basic two-dimensional lattice whose periodicity is determined such that a resonant state of the light having the wavelength lambda L is created by forming a two-dimensional standing wave while the light having the wavelength lambda L is prevented from being emitted to an outside, and
a modulation phase PSI (x, y) at each lattice point is expressed as
PSI (x,y)Intg G'(x,y)dxdy [Expression 1]
by using a reciprocal lattice vector G'(x, y) (up arrow) =(g'x(x), g'y(y))=(kx+-|k (up arrow) |sin theta x(x)/neff, ky+-|k (up arrow) |sin theta y(y)/neff) that is expressed by using: a wave vector k (up arrow) =(kx, ky) of the light having the wavelength lambda L in the two-dimensional photonic crystal layer; an effective refractive index neff of the two-dimensional photonic crystal layer; and angles theta x(x) and theta y(y) that are respectively defined by sin theta x(x)=sin theta (x, y) cos phi (x, y) and sin theta y(y), sin theta (x, y) sin phi (x, y) from the inclination angle theta (x, y) and the azimuthal angle phi (x, y).
[claim2]
2. The two-dimensional photonic crystal surface emitting laser according to claim 1, further comprising a plurality of electrodes including a pair of electrodes for injecting the electric current into the active layer, the pair of electrodes being arranged so as to sandwich the active layer and the two-dimensional photonic crystal layer, one or both of the pair of electrodes being one-dimensionally or two-dimensionally arranged in parallel to the active layer and the two-dimensional photonic crystal layer.
[claim3]
3. The two-dimensional photonic crystal surface emitting laser according to claim 2, wherein one of the pair of electrodes is arranged as a plurality of linear electrodes on one side substantially in parallel; and
another of the pair of electrodes is arranged as a plurality of linear electrodes on another side substantially in parallel and in a direction different from that of the linear electrodes on one side.
[claim4]
4. A two-dimensional photonic crystal surface emitting laser apparatus comprising: the two-dimensional photonic crystal surface emitting laser according to claim 1; and
a current-injecting position controller for controlling a current-injecting position at which an electric current is injected into the active layer.
[claim5]
5. The two-dimensional photonic crystal surface emitting laser apparatus according to claim 4, wherein the current-injecting position controller includes: a plurality of electrodes including a pair of electrodes arranged so as to sandwich the active layer and the two-dimensional photonic crystal layer, one or both of the pair of electrodes being one-dimensionally or two-dimensionally arranged in parallel to the active layer and the two-dimensional photonic crystal layer; and
a switch for switching electrodes for injecting the electric current into the active layer, among the plurality of electrodes.
[claim6]
6. The two-dimensional photonic crystal surface emitting laser apparatus according to claim 5, wherein one of the pair of electrodes is arranged as a plurality of linear electrodes on one side substantially in parallel; and
another of the pair of electrodes is arranged as a plurality of linear electrodes on another side substantially in parallel and in a direction different from that of the linear electrodes on one side.
[claim7]
7. The two-dimensional photonic crystal surface emitting laser apparatus according to claim 5, wherein the switch causes two or more electrodes of the plurality of electrodes to simultaneously injects the electric currents into the active layer, and
magnitudes of the injected electric currents are different for each of the electrodes from which the electric currents are simultaneously injected.
[claim8]
8. The two-dimensional photonic crystal surface emitting laser apparatus according to claim 6, wherein the switch causes two or more electrodes of the plurality of electrodes to simultaneously injects the electric currents into the active layer, and
magnitudes of the injected electric currents are different for each of the electrodes from which the electric currents are simultaneously injected.
  • 発明者/出願人(英語)
  • NODA SUSUMU
  • OKINO TSUYOSHI
  • KITAMURA KYOKO
  • TANAKA YOSHINORI
  • LIANG YONG
  • YASUDA DAIKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
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