A5039154753- Photonic and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Superconducting and THz Device Technology
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Advanced MEMS and NEMS Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Spectroscopy and Laser Applications
- Spacecraft and Cryogenic Technologies
- Analytical Chemistry and Sensors
- Mechanical and Optical Resonators
- Nanofluid Flow and Heat Transfer
- Advanced Thermodynamic Systems and Engines
- Optical Coatings and Gratings
- Fluid Dynamics and Vibration Analysis
- Plasmonic and Surface Plasmon Research
- Fluid Dynamics and Turbulent Flows
University of Southampton
1983-2023
Germanium is a material of high interest for midinfrared (MIR) integrated photonics due to its CMOS compatibility and wide transparency window covering the 2-15 µm spectral region exceeding 4 8 limit Silicon-on-Insulator (SOI) platform Si respectively.In this Letter, we report suspended germanium waveguides operating at wavelength 7.67 with propagation loss 2.6 ± 0.3 dB/cm.To our knowledge, first demonstration low-loss such long wavelength.Suspension waveguide achieved by defining holes...
In this paper we review our recent results on group IV mid-infrared photonic devices.In particular, passive structures suitable for long wavelength operation, such as suspended Si, Ge-on-Si and Ge, are analyzed.In addition, Ge-on-insulator waveguides have been characterized at 3.8 μm.Several active devices also realized: optical modulators in silicon germanium, graphene detectors operating shorter mid-IR wavelengths.
The mid-infrared (MIR) wavelength region is attracting more and research for applications such as medical diagnostics, environmental monitoring, free space communications. In the MIR, thermal detectors play an important role because they can operate over a large range, be fabricated using CMOS compatible processes, do not require cooling. Today, no other MIR detector technology able to fill this gap. We demonstrate first uncooled silicon waveguide-based bolometers, in Silicon-on-Insulator...
In recent years, sensing and communication applications have fueled important developments of group-IV photonics in the mid-infrared band. long-wave range, most platforms are based on germanium, which is transparent up to ∼15-µm wavelength. However, those limited by intrinsic losses complementary materials or require complex fabrication processes. To overcome these limitations, we propose suspended germanium waveguides with a subwavelength metamaterial lateral cladding that simultaneously...
Bolometers are thermal detectors widely applied in the mid-infrared (MIR) wavelength range. In an integrated sensing system on chip, a broadband scalable bolometer absorbing light over whole MIR range could play important role. this work, we have developed waveguide-based operating of 3.72–3.88 µm amorphous silicon (a-Si) platform. Significant improvements design result <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mn>20</mml:mn> <mml:mo>×</mml:mo>...
Group IV platforms can operate at longer wavelengths due to their low material losses. By combining graphene and Si Ge platforms, photodetection be achieved by using graphene’s optical properties coplanar integration methods. Here, we presented a waveguide coupled photodetector operating wavelength of 3.8 μm.
We present ring resonator (RR)-coupled Mach-Zehnder interferometers (MZIs) based on silicon-on-insulator rib waveguides, operating around the mid-IR wavelength of 3.8 μm. A number different photonic integrated devices have been designed and fabricated experimentally to obtain asymmetric Fano resonances in mid-IR. investigated influence coupling efficiency between RR MZI as well phase shift two arms Fano-type resonance spectral features, agreement with theoretical predictions. Finally,...
We report a new method of accurately measuring the mid-infrared absorption fluid analytes using on-chip waveguides that allows measurements to be referenced for noise and drift reduction whilst only single external detector. A silicon-on-insulator waveguide circuit integrated with microfluidic channel is made in which pair switches alternate light between an evanescent sensor reference at rate few kHz, thus allowing low frequency common components removed from measurement, leading floor by...
This work describes the integration of mid-infrared (MIR) silicon photonics with PDMS microfluidics to perform absorption spectroscopy IPA-water solutions. The MIR spectral region contains strong bands for many molecules, and photonic devices operating in can be used sensing applications. In this a preliminary demonstration silicon-on-insulator (SOI) device is carried out which transmission spectra different concentrations water-IPA solutions are measured at wavelengths between 3.725 μm...
We present our recent results on mid-infrared photonic devices, including component optimisation, circuit design and their application to sensing. show the performance of an on-chip FTIR microspectrometer implemented in silicon-on-insulator. A self-referenced switching sensor improves noise rejection by a factor 11 compared regular waveguide sensor. demonstrate waveguides with single-moded guidance over octave frequency at wavelengths enable spectroscopy suppressing higher-order modes. apply...
Germanium has become a material of high interest for mid-infrared (MIR) integrated photonics due to its complementary metal-oxide-semiconductor (CMOS) compatibility and wide transparency window covering the 2-15 μm spectral region exceeding 4 8 limit Silicon-on-Insulator (SOI) platform Si respectively. Here, we present suspended germanium waveguides operating at wavelengths 3.8 7.67 with propagation losses 2.9 ± 0.2 dB/cm 2.6 0.3
Presentation: Suspended silicon waveguide devices for mid-infrared sensing undefined the Emerging Applications in Silicon Photonics conference of SPIE Photonex and Vacuum Expo 2020
The mid-infrared (mid-IR) is an important wavelength range for vibrational absorption spectroscopy (e.g. gas sensing, medical diagnostics, environmental monitoring), and thus there a strong need small stable on-chip spectrometers. It also desirable it to be inexpensive fabricate able perform high-resolution measurements over wide bandwidth. To this end, we demonstrate two kinds of mid-IR thermo-optic type Fourier Transform spectrometers (FTS). Both variations the device are designed target...
In this paper we present silicon and germanium-based material platforms for the mid-infrared wavelength region report several active passive devices realised in these materials. We particularly focus on circuits wavelengths longer than 7 micrometers.
We demonstrate the first waveguide-based bolometers on Silicon-on-Insulator (SOI) platform for mid-infrared (MIR) wavelengths, which use plasmonic antennas as absorbing elements. The bolometer achieves a sensitivity of 0.80 % change in resistance per milliwatt input power at 3.8 μm wavelength.
We demonstrate the first waveguide-based bolometers on Silicon-on-Insulator (SOI) platform for mid-infrared (MIR) wavelengths, which use plasmonic antennas as absorbing elements. The bolometer achieves a sensitivity of 0.80 % change in resistance per milliwatt input power at 3.8 μm wavelength.
The mid-infrared (MIR) wavelength region contains unique absorption fingerprints of many molecules and substances. Therefore, the main application area in MIR can be sensing. Si Ge are transparent this range (Si up to 8 μm, 15 μm) due their excellent electrical optical properties CMOS compatibility they offer suitable platforms for realisation compact sensors. However, claddings used telecom usually not at longer wavelengths high absorption, so alternative solutions need investigated. In...
We review our recent results on modulators and detectors for the 2μm range, which may become very relevant future communications, development of mid-IR broadband devices sensing applications. show Mach-Zehnder Michelson based operating at data rates up to 25 Gb/s Ge 12.5 Gb/s. For longer wavelengths applications, we present waveguides splitters, waveguide integrated bolometers, realisation a mid-infrared sensor.
We demonstrate a suspended germanium waveguide platform with propagation loss of 5.3 dB/cm at wavelength 7.7 µm, potential applications in free-space optical communications and absorption sensing. Furthermore, our simulations show low-loss up to ~15-µm wavelength.