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    • 6. 发明授权
    • Photonic crystal surface-emitting lasers
    • 光子晶体发射激光器
    • US09065249B2
    • 2015-06-23
    • US14525795
    • 2014-10-28
    • Song Liang ChuaLing LuMarin Soljacic
    • Song Liang ChuaLing LuMarin Soljacic
    • H01S5/10H01S5/18H01S5/34H01S5/187
    • H01S5/105H01S5/18H01S5/187H01S5/34
    • 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.
    • 光子晶体表面发射激光器(PCSEL)包括与光子晶体电磁耦合的增益介质,其能带结构在光子晶体的布里渊区域的中心处呈现线性色散的狄拉克锥形。 这个狄拉克锥体的顶点称为狄拉克点; 因为它是在布里渊区中心,它被称为意外的狄拉克点。 调整光子晶体的带结构(例如,通过改变光子晶体的尺寸或折射率)以显示出意外的狄拉克点,使光子晶体的模式间隔增加数量级,并且减少或消除光子晶体的分布在平面内的反馈。 因此,光子晶体可以作为一个谐振器,它支持来自PCSEL的单模输出在比具有二次带边缘色散的常规PCSEL更大的区域上。 由于输出功率通常随输出面积而增加,所以输出面积的增加导致更高的输出功率。