Robert Halir
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View article: Ultra‐Compact Broadband Spot Size Converter Using Metamaterial Cell‐Based Inverse Design
Ultra‐Compact Broadband Spot Size Converter Using Metamaterial Cell‐Based Inverse Design Open
With the expansion of silicon photonics from datacom applications into emerging fields like optical I/O, quantum and programmable photonics, there is an increasing demand for devices that combine ultra‐compact footprints, low losses, and b…
View article: Simulation and Experimental data of Anisotropic cell-based SSC
Simulation and Experimental data of Anisotropic cell-based SSC Open
This dataset contains the raw data for the figures (Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. S2) in the publication entitled "Ultra-compact broadband spot size converter using metamaterial cell-based inverse design". All relevant infor…
View article: Robust integrated optical feedback interferometry via variable optical attenuation
Robust integrated optical feedback interferometry via variable optical attenuation Open
Robust operation of optical feedback interferometry-based instruments requires controlling the amount of light that is reflected back into the laser. To this end, here we propose an on-chip optical feedback interferometry system with an in…
View article: Parabolic dielectric reflector for extreme on-chip spot-size conversion with broad bandwidth
Parabolic dielectric reflector for extreme on-chip spot-size conversion with broad bandwidth Open
Spot-size converters are key for efficient coupling of light between waveguides of different sizes. While adiabatic tapers are well suited for small size differences, they become impractically long for expansion factors around x100 which a…
View article: A systemic model for lossy mode resonances (LMRs)
A systemic model for lossy mode resonances (LMRs) Open
Lossy mode resonances (LMRs) have been widely employed for the development of sensors in the last years. However, the theoretical frameworks for LMRs are scarce and difficult to systematize, hampering the development of this technology. In…
View article: Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings
Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings Open
Several emerging applications of silicon photonics, including sensing, ranging and optical trapping, require fixed, well-collimated beams that enable interaction with targets placed centimeters away from the chip. Generating such beams wit…
View article: Ultra-efficient surface grating couplers for chip-to-fiber and chip-to-free-space coupling based on single-beam radiation
Ultra-efficient surface grating couplers for chip-to-fiber and chip-to-free-space coupling based on single-beam radiation Open
Surface grating couplers, such as fiber-chip grating couplers and optical antennas, are fundamental devices in photonic integrated circuits, as they enable the coupling of light between the chip and an external medium. An important metric …
View article: Ultra-efficient surface grating couplers for chip-to-fiber and chip-to-free-space coupling based on single-beam radiation
Ultra-efficient surface grating couplers for chip-to-fiber and chip-to-free-space coupling based on single-beam radiation Open
Surface grating couplers, such as fiber-chip grating couplers and optical antennas, are fundamental devices in photonic integrated circuits, as they enable the coupling of light between the chip and an external medium. An important metric …
View article: Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings
Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings Open
Several emerging applications of silicon photonics, including sensing, ranging and optical trapping, require fixed, well-collimated beams that enable interaction with targets placed centimeters away from the chip. Generating such beams wit…
View article: Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings
Large beam size grating coupler in silicon-on-insulator using fully etched subwavelength gratings Open
Several emerging applications of silicon photonics, including sensing, ranging and optical trapping, require fixed, well-collimated beams that enable interaction with targets placed centimeters away from the chip. Generating such beams wit…
View article: Dual-polarization photonic integrated biosensor in a Mach-Zehnder interferometer with coherent phase readout
Dual-polarization photonic integrated biosensor in a Mach-Zehnder interferometer with coherent phase readout Open
Photonic integrated biosensors have garnered considerable attention due to their promising applications in various fields such as healthcare. Differentiating specific targets from interfering background effects is a challenging task. In th…
View article: High-Performance Bimodal Evanescent-Field Sensor With Coherent Phase Readout
High-Performance Bimodal Evanescent-Field Sensor With Coherent Phase Readout Open
By comparing optical signals travelling through a sensing and a reference arm, interferometric photonic sensors achieve remarkable sensitivities and detection limits using sim- ple single-wavelength laser sources. Sensors based on bimodal …
View article: Recent advances in metamaterial integrated photonics
Recent advances in metamaterial integrated photonics Open
Since the invention of the silicon subwavelength grating waveguide in 2006, subwavelength metamaterial engineering has become an essential design tool in silicon photonics. Employing well-established nanometer-scale semiconductor manufactu…
View article: Silicon photonic mode multiplexers based on subwavelength metamaterials and on-chip beamforming
Silicon photonic mode multiplexers based on subwavelength metamaterials and on-chip beamforming Open
Integration of photonic circuits on silicon offers a unique opportunity to address the scaling of inter- and intra-chip communications in an energy-efficient and cost-effective manner. Mode-division multiplexing (MDM) is deemed as one of t…
View article: Broadband and low-loss TM-pass polarizer using tilted subwavelength structures
Broadband and low-loss TM-pass polarizer using tilted subwavelength structures Open
Photonic systems built on the Silicon-on-Insulator platform exhibit a strong birefringence, and must thus be operated with a single polarization for most applications. Hence, on-chip polarizers that can effectively suppress an undesired po…
View article: Subwavelength-engineered metamaterial devices for integrated photonics
Subwavelength-engineered metamaterial devices for integrated photonics Open
Subwavelength grating metamaterials have become an integral design tool in silicon photonics. The lithographic segmentation of integrated waveguides at the subwavelength scale allows us to control optical properties such as mode delocaliza…
View article: Polarization independent 2×2 multimode interference coupler with bricked subwavelength metamaterial
Polarization independent 2×2 multimode interference coupler with bricked subwavelength metamaterial Open
The silicon-on-insulator (SOI) platform enables high integration density in photonic integrated circuits while maintaining compatibility with CMOS fabrication processes. Nevertheless, its inherently high modal birefringence hinders the dev…
View article: Dataset for A broadband 2x2 multimode interference coupler for mid-infrared wavelengths
Dataset for A broadband 2x2 multimode interference coupler for mid-infrared wavelengths Open
This dataset supports the publication: Callum J. Stirling, Robert Halir, Alejandro Sanchez-Postigo, Zhibo Qu, Jamie D. Reynolds, Jordi Soler Penades, Ganapathy Senthil Murugan, Alejandro Ortega-Monux, J. Gonzalo Wanguemert-Perez, Inigo Mol…
View article: Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation
Mode Converter and Multiplexer With a Subwavelength Phase Shifter for Extended Broadband Operation Open
4 pags., 3 figs., 1 tab.
View article: Broadband 2 × 2 multimode interference coupler for mid-infrared wavelengths
Broadband 2 × 2 multimode interference coupler for mid-infrared wavelengths Open
Beam splitters are core components of photonic integrated circuits and are often implemented with multimode interference couplers. While these devices offer high performance, their operational bandwidth is still restrictive for sensing app…
View article: A review of silicon subwavelength gratings: building break-through devices with anisotropic metamaterials
A review of silicon subwavelength gratings: building break-through devices with anisotropic metamaterials Open
Silicon photonics is playing a key role in areas as diverse as high-speed optical communications, neural networks, supercomputing, quantum photonics, and sensing, which demand the development of highly efficient and compact light-processin…
View article: Breaking the Coupling Efficiency–Bandwidth Trade‐Off in Surface Grating Couplers Using Zero‐Order Radiation
Breaking the Coupling Efficiency–Bandwidth Trade‐Off in Surface Grating Couplers Using Zero‐Order Radiation Open
Silicon photonics provides wafer‐scale fabrication of densely integrated photonic circuits that are enabling breakthrough applications in datacom, artificial intelligence, and healthcare. The sub‐micrometer mode size of silicon waveguides …
View article: Bricked Subwavelength Gratings: A Tailorable On‐Chip Metamaterial Topology
Bricked Subwavelength Gratings: A Tailorable On‐Chip Metamaterial Topology Open
Integrated metamaterials are redefining the capabilities of silicon photonic chips. In providing lithographic control over dielectric permittivity, dispersion and anisotropy, they are enabling photonic devices with unprecedented performanc…
View article: Subwavelength-grating metamaterial integrated devices for the near- and mid-infrared wavelengths
Subwavelength-grating metamaterial integrated devices for the near- and mid-infrared wavelengths Open
The subwavelength patterning of planar structures is now widely used in silicon photonics, enabling the synthesis of metamaterials with engineered optical properties, including refractive index, dispersion, and anisotropy. A wide range of …
View article: Building high-performance integrated optical devices using subwavelength grating metamaterials -INVITED
Building high-performance integrated optical devices using subwavelength grating metamaterials -INVITED Open
The use of subwavelength grating structures in silicon waveguides have fuelled the development of integrated optical components with superior performance. By a judicious lithographic patterning of the grating, the optical properties of the…
View article: Coherent silicon photonic interferometric biosensor with an inexpensive laser source for sensitive label-free immunoassays
Coherent silicon photonic interferometric biosensor with an inexpensive laser source for sensitive label-free immunoassays Open
Over the past two decades, integrated photonic sensors have been of major interest to the optical biosensor community due to their capability to detect low concentrations of molecules with label-free operation. Among these, interferometric…