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    • 71. 发明申请
    • NEAR FIELD OPTICAL APPARATUS
    • 近场光学装置
    • WO01017079A1
    • 2001-03-08
    • PCT/US2000/024335
    • 2000-08-30
    • H01S5/028H01S5/183
    • H01S5/18394H01S5/18327H01S5/1835H01S5/18361H01S5/18375H01S5/18377H01S5/18391H01S2301/176H01S2301/18
    • A near field optical apparatus (14) comprising a conductive sheet or plane (16) having an aperture therein, with the conductive plane (16) including at least one protrusion (20) which extends into the aperture. The location, structure and configuration of the protrusion (20) or protrusions (20) can be controlled to provide desired near field localization of optical power output associated with the aperture. Preferably, the location, structure and configuration of the protrusion (20) are tailored to maximize near field localization at generally the center of the aperture. The aperture preferably has a perimeter dimension which is substantially resonant with the output wavelength of the light source, or is otherwise able to support a standing wave of significant amplitude. The apparatus (14) may be embodied in a vertical cavity surface emitting layer or VCSEL having enhanced near field brightness by providing a conductive layer on the laser emission facet, with a protrusion (20) of the conductive layer extending into an aperture in the emission facet. The aperture in the emission facet preferably has dimensions smaller than the guide mode of the laser, and the aperture preferably defines different regions of reflectivity under the emission facet. The depth of the aperture can be etched to provide a particular target loss, and results in higher optical power extraction from the emission facet.
    • 一种近场光学设备(14),包括其中具有孔的导电片或平面(16),所述导电平面(16)包括延伸到所述孔中的至少一个突起(20)。 可以控制突起(20)或突起(20)的位置,结构和构造,以提供与孔相关联的光功率输出的期望的近场定位。 优选地,突出物(20)的位置,结构和构造被调整为使孔的大致中心处的近场定位最大化。 孔径优选具有基本上与光源的输出波长共振的周边尺寸,或者否则能够支持显着振幅的驻波。 可以通过在激光发射小面上提供导电层而将装置(14)体现在具有增强的近场亮度的垂直腔表面发射层或VCSEL中,其中导电层的突起(20)延伸到发射的孔中 面。 发射小面的孔径优选具有小于激光器的引导模式的尺寸,并且孔径优选地在发射面下限定不同的反射率区域。 可以蚀刻孔径的深度以提供特定的目标损耗,并且导致从发射面提取更高的光功率。