摘要:
Planar, polarization insensitive, optical elements to control refraction of transmitted light in free space are disclosed. In one aspect, an optical element includes a substrate having a planar surface, and a polarization insensitive, high contrast, sub-wavelength grating composed of posts that extend from the planar surface. The grating has at least one region. Within each region, cross-sectional dimensions of the posts and/or lattice arrangement of the posts are nonperiodically varied to control refraction of light transmitted through the optical element.
摘要:
A lens and a method of forming a lens are included. A lens can include a plurality of concentric rings formed from a dielectric material interleaved by a plurality of gaps separating the plurality of concentric rings.
摘要:
Embodiments of the present invention relate to planar optical devices composed of one or more sub-wavelength diffraction grating layers. In one embodiment, an optical device includes a first substantially planar reflective structure (104,1904), a second substantially planar reflective structure (106,1906), and a substantially planar sub-wavelength grating layer (102,1902) disposed between the first reflective structure and the second reflective structure. The grating layer is configured with lines (208-211,214-217) having line widths, line thicknesses, and line period spacing selected to control phase changes in different portions of a beam of light transmitted through the optical device.
摘要:
Embodiments of the present invention relate to planar optical devices composed of one or more sub-wavelength diffraction grating layers. In one embodiment, an optical device includes a first substantially planar reflective structure (104,1904), a second substantially planar reflective structure (106,1906), and a substantially planar sub-wavelength grating layer (102,1902) disposed between the first reflective structure and the second reflective structure. The grating layer is configured with lines (208-211, 214-217) having line widths, line thicknesses, and line period spacing selected to control phase changes in different portions of a beam of light transmitted through the optical device.
摘要:
A lens and a method of forming a lens are included. A lens can include a plurality of concentric rings formed from a dielectric material interleaved by a plurality of gaps separating the plurality of concentric rings.
摘要:
Aspects of the present invention are directed to flat sub-wavelength dielectric gratings that can be configured to operate as mirrors and other optical devices. In one aspect, a grating layer (102) has a planar geometry and is configured with lines (206,207). The lines widths, line thicknesses and line period spacings (208) are selected to control phase changes in different portions of a beam of light reflected from the grating such that the phase changes collectively produce a desired wavefront shape in the beam of light reflected from the grating.
摘要:
An optical apparatus includes an optical fiber formed of a core surrounded by cladding, in which the optical fiber includes an end portion. In addition, an optical layer composed of a material having a relatively high refractive index is positioned on the end portion, in which the optical layer includes a non-periodic sub-wavelength grating positioned in optical communication with the core.
摘要:
Aspects of the present invention are directed to flat sub-wavelength dielectric gratings that can be configured to operate as mirrors and other optical devices. In one aspect, a grating layer (102) has a planar geometry and is configured with lines (206,207). The lines widths, line thicknesses and line period spacings (208) are selected to control phase changes in different portions of a beam of light reflected from the grating such that the phase changes collectively produce a desired wavefront shape in the beam of light reflected from the grating.
摘要:
Compact photonics platforms and methods of forming the same are provided. An example of a compact photonics platform includes a layered structure having an active region along a longitudinal axis, a facet having an angle no less than a critical angle formed at least one longitudinal end of the active region, and a waveguide having at least one grating coupler positioned in alignment with the angled facet to couple light out to or in from the waveguide.
摘要:
An integrated sub-wavelength grating element includes a transparent layer formed over an optoelectronic substrate layer and a sub-wavelength grating element formed into a grating layer disposed on said transparent layer. The sub-wavelength grating element is formed in alignment with an active region of an optoelectronic component within the optoelectronic substrate layer. The sub-wavelength grating element affects light passing between said grating element and said active region. A method for forming an integrated sub-wavelength grating element is also provided.