Luneburg lens in silicon photonics

Falco, Andrea Di; Kehr, Susanne C.; Leónhardt, Ulf

doi:10.1364/oe.19.005156

Cited by 105 publications

(72 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One might expect that the less the demands on the index range become, the higher the requirements on the accuracy of the profile. Graded refractive-index materials or tapered waveguides [35,36] instead of metamaterials might not suffer from problems caused by the granularity of a metamaterial.…”

Section: Discussionmentioning

confidence: 99%

Subwavelength imaging with materials of in-principle arbitrarily low index contrast

Gui¹,

Sahebdivan²,

Ong³

et al. 2012

New J. Phys.

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Subwavelength imaging with materials of in-principle arbitrarily low index contrast

Gui¹,

Sahebdivan²,

Ong³

et al. 2012

New J. Phys.

View full text Add to dashboard Cite

“…The grayscale lithography is achieved via dose modulation for patterning the photonic device with vertical resolution of B10 nm. Note that although similar processes are employed in the fabrication of diffractive optical elements, micro-electro-mechanical structures and lower contrast gradedindex lenses [21][22][23][24][25] with relatively weak height variations of 80 nm over distances of tens of microns, in our case, the process enables strong height variations of 400 nm over less than 1 mm while maintaining precise control of both the resist height profile on the nanometre scale. Figure 3 shows the grayscale patterned device with a smooth surface profile in Si.…”

Section: Resultsmentioning

confidence: 99%

On-chip transformation optics for multimode waveguide bends

et al. 2012

View full text Add to dashboard Cite

Current optical communication systems rely almost exclusively on multimode fibres for short-and medium-haul transmissions, and are now expanding into the long-haul arena. Ultra-high bandwidth applications are the main drive for this expansion, based on the ability to spatially multiplex data channels in multimode systems. Integrated photonics, on the other hand, although largely responsible for today's telecommunications, continues to operate almost strictly in the single-mode regime. This is because multimode waveguides cannot be compactly routed on-chip without significant inter-mode coupling, which impairs their data rate and prevents the use of modal multiplexing. Here we propose a platform for on-chip multimode devices with minimal inter-mode coupling, opening up the possibilities for integrated multimode optics. Our work combines a novel theoretical approach-large-scale inverse design of transformation optics to maximize performance within fabrication constraints-with unique grayscale-lithography fabrication of an exemplary device: a low-crosstalk multimode waveguide bend.

show abstract

“…Almost diffraction-limited (~0.7λ) focusing of 515 nm light (Fig.3) emitted by the fiber tip (seen on the left) clearly demonstrates Luneburg lens-like focusing behavior of our birefrigent TO device arrays for TM polarized light. Note that previous attempts of TO lens fabrication [9,10] were only able to achieve focusing spot size of the order of 3λ, so that an order of magnitude improvement in TO lens quality has been achieved in our experiments. Comparison of theoretical and experimental images performed in Fig.…”

mentioning

confidence: 76%