A5086451808- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Semiconductor Quantum Structures and Devices
- Conferences and Exhibitions Management
- Analytical Chemistry and Sensors
- Plasmonic and Surface Plasmon Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Mechanical and Optical Resonators
- Climate Change Communication and Perception
University of Southampton
2017-2024
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.
Silicon photonics is one of the most dynamic fields within photonics, and it has seen huge progress in last 20 years, addressing applications data centers, autonomous cars, sensing. It mostly focused on telecommunications wavelength range (1.3 1.55 µm), where silicon becomes transparent. In this range, there are excellent light sources photodetectors, as well optical fibers operating with extremely low losses dispersion. a technology that hugely benefits from availability complementary...
Mid-infrared spectroscopy enabled by silicon photonics has received great interest in recent years as a pathway for scalable sensing technology. The development of such devices would realise inexpensive and accessible instrumentation wide variety uses over numerous fields. However, not every application is the same; to produce sensors real-world scenarios, engineers need flexibility device design but also maintain compatibility with fabrication processes. Sub-wavelength gratings can offer...
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,...
Beam splitters are core components of photonic integrated circuits and often implemented with multimode interference couplers. While these devices offer high performance, their operational bandwidth is still restrictive for sensing applications in the mid-infrared wavelength range. Here we experimentally demonstrate a subwavelength-structured 2×2 coupler performance 3.1-3.7µm range, doubling conventional device.
Increasing the working optical bandwidth of a photonic circuit is important for many applications, in particular chemical sensing at mid-infrared wavelengths. This useful not only limited by transparency range waveguide materials, but also over which single or multimoded predictable behaviour. In this work, we show first experimental demonstration "endlessly single-mode" waveguiding silicon photonics. Silicon-on-insulator waveguides were designed, fabricated and characterised 1.95 µm 3.80...
We review our recent results on integration of lasers, detectors and microfluidic channels silicon germanium based mid-infrared photonic circuits, as well initial sensing experiments for medical gas applications. Wideband devices, such waveguides, couplers, splitters are required mid-IR absorption spectroscopy. show that Si Ge devices can operate over large spectral bands.
We present the development of Ge-on-Si waveguide-based devices for low-noise mid-infrared absorption spectroscopy aqueous solutions, targeting wavelengths between 6 and 10 μm, that are able to reduce relative intensity noise which is a key roadblock when measuring tiny analyte absorptions masked by large background matrix absorption. The sensor uses pair integrated thermo-optic switches continuously switch light reference waveguide waveguide, so common components can be cancelled out, even...
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...
The 16th May 2018 marks the first annual International Day of Light (IDL). steering committee IDL initiative encouraged grassroots activities to increase awareness and understanding applications light. One such undertaking is program events developed by postgraduate students Optoelectronics Research Centre (ORC) at University Southampton (UoS). focused on engaging with public local schools low levels progression higher education. Three were designed: an outreach masterclass, combining...
In this work, potential ways of accessing a greater spectral range at mid-infrared (MIR) wavelength ranges in silicon photonics are explored, particular for sensing applications that use on-chip spectroscopy. To utilise the full low-loss transmission silicon, membranes transfer printed onto MIR-transparent substrates waveguides with no absorption from substrate. A Y-junction splitter low loss across 1 µm optical bandwidth is also designed and experimentally demonstrated.
Rifampicin is an antimicrobial drug used to treat tuberculosis. The deterioration of a tuberculosis patient on rifampicin serious event with several possible causes. Rapid bedside measurement would enable clinicians determine if was due subtherapeutic levels and quickly correct the dosing. It also support personalised dosing maximise effectiveness whilst minimising side effects. optimum therapeutic concentration range 8 – 24 mg/L. We report ATR-FTIR spectroscopy data for detection monitoring...
We present the development of SOI waveguides with low-loss (~1.5 dB/cm) single-moded guidance over an octave frequency. Broadband is needed for on-chip mid-infrared spectroscopy and this cannot be provided by conventional waveguide geometries in standard material platforms. The reported require a simple fabrication process flow will widely applicable to different wavelength bands variety sensing applications. further bend design (0.179 ± 0.031 dB/90°) that overcomes inherently large bending...
Showcasing cutting edge physics research to school children and the general public humanizes ‘the scientist’. This can help towards removing stereotypes enabling greater diversity in physics. Here we share some of lessons learnt activities conducted at University Southampton achieve this goal.
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.
Silicon photonics is an enabling platform for high-speed optical communications and sensing. Here we review some recent advances in building devices with breakthrough performance using subwavelength metamaterials as well advanced sensing systems leveraging telecom techniques.