Device comprising a strained germanium membrane
US-9502864-B2 · Nov 22, 2016 · US
Photonic crystal surface-emitting lasers
US9065249B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9065249-B2 |
| Application number | US-201414525795-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 28, 2014 |
| Priority date | Jun 18, 2012 |
| Publication date | Jun 23, 2015 |
| Grant date | Jun 23, 2015 |
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Abstract
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A photonic-crystal surface-emitting laser (PCSEL) includes a gain medium electromagnetically coupled to a photonic crystal whose energy band structure exhibits a Dirac cone of linear dispersion at the center of the photonic crystal's Brillouin zone. This Dirac cone's vertex is called a Dirac point; because it is at the Brillouin zone center, it is called an accidental Dirac point. Tuning the photonic crystal's band structure (e.g., by changing the photonic crystal's dimensions or refractive index) to exhibit an accidental Dirac point increases the photonic crystal's mode spacing by orders of magnitudes and reduces or eliminates the photonic crystal's distributed in-plane feedback. Thus, the photonic crystal can act as a resonator that supports single-mode output from the PCSEL over a larger area than is possible with conventional PCSELs, which have quadratic band edge dispersion. Because output power generally scales with output area, this increase in output area results in higher possible output powers.
First claim
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What is claimed is: 1. A surface-emitting laser comprising: a gain medium to emit an electromagnetic wave; and a photonic crystal, electromagnetically coupled to the gain medium, having an energy band structure characterized by a Brillouin zone to support radiation of at least a portion of the energy in the electromagnetic wave in a direction substantially orthogonal to a plane of the photonic crystal, wherein a first radiation-loss linewidth of a first band-edge mode in the e…
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- What does patent US9065249B2 cover?
- A photonic-crystal surface-emitting laser (PCSEL) includes a gain medium electromagnetically coupled to a photonic crystal whose energy band structure exhibits a Dirac cone of linear dispersion at the center of the photonic crystal's Brillouin zone. This Dirac cone's vertex is called a Dirac point; because it is at the Brillouin zone center, it is called an accidental Dirac point. Tuning the ph…
- Who is the assignee on this patent?
- Chua Song Liang, Lu Ling, Soljacic Marin, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H01S5/105. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 23 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).