| 1. |
- Ottonello-Briano, Floria, et al.
(författare)
-
Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Carbon dioxide is a vital gas for life on Earth, a waste product of human activities, and widely used in agriculture and industry. Its accurate sensing is therefore of great interest. Optical sensors exploiting the mid-infrared light absorption of CO2 provide high selectivity, but their large size and high cost limit their use. Here, we demonstrate CO2 gas sensing at 4.2 μm wavelength using an integrated silicon waveguide, featuring a sensitivity to CO2 of 44% that of free-space sensing. The suspended waveguide is fabricated on a silicon-on-insulator substrate by a single-lithography-step process, and we route it into a mid-infrared photonic circuit for on-chip-referenced gas measurements. Its demonstrated performance and its simple and scalable fabrication make our waveguide ideal for integration in miniaturized CO2 sensors for distributed environmental monitoring, personal safety, medical, and high-volume consumer applications.
|
|
| 2. |
- Aparicio, Francisco, et al.
(författare)
-
Incorporation of luminescent nanometric films in photonic crystals and devices for the development of photonic sensors
- 2010
-
Konferensbidrag (refereegranskat)abstract
- Dye molecules embedded in different matrices in the form of thin films are the basis of specific materials used for laser cavities, optical filters, optical gas sensors, etc. In the present communication we discuss a new methodology based on the remote microwave plasma assisted deposition of dye containing thin films that circumvent the above mentioned problems. It permits a tailored synthesis of optically active nanometric thin films containing dye molecules which are active as fluorescence emitters (i.e., coloured and fluorescent films). The principle of this new procedure is the partial polymerization of dye molecules that are evaporated over a substrate while exposed to a remote microwave Ar plasma. As a result of this process a polymeric thin film is produced in one step where some dye molecules keep intact their optical activity (although eventually, their optical response can be slightly modified by matrix effects). This methodology has been recently used for the deposition of novel plasma nanocomposites containing non-aggregated laser dyes to maximize the fluorescent emission of the materials and for the fabrication of optical NO2 sensing nanocomposites. To illustrate the possibilities of the technique we present here results for different fluorescent dye molecules, as perylene dyes, and several xanthene and oxazine derivative cationic dyes which are typically used as gain media in tuneable laser dyes. The luminescent, optical and sensing properties of these dye containing nanocomposites will be presented. These active optical layers are being developed for the fabrication of photonic sensor devices, optical filters and photonic chips (PHODYE EU Project). This is due to the full compatibility of the synthetic methodology with the present integrated microelectronic and optoelectronic technology. The possibilities for the fabrication of photonic devices integrating these active optical layers will be demonstrated. Especial attention will be paid to recent results about the incorporation of the luminescent films in photonic crystals and about the conformal growth of luminescent planar defects within artificial opals.
|
|
| 3. |
- Aparicio, Francisco J., et al.
(författare)
-
Transparent Nanometric Organic Luminescent Films as UV-Active Components in Photonic Structures
- 2011
-
Ingår i: Advanced Materials. - : Wiley. - 0935-9648 .- 1521-4095. ; 23:6, s. 761-765
-
Tidskriftsartikel (refereegranskat)abstract
- A new kind of visible-blind organic thin-film material, consisting of a polymeric matrix with a high concentration of embedded 3-hydroxyflavone (3HF) dye molecules, that absorbs UV light and emits green light is presented. The thin films can be grown on sensitive substrates, including flexible polymers and paper. Their suitability as photonic active components in photonic devices is demonstrated.
|
|
| 4. |
- Barrios, Carlos Angulo, et al.
(författare)
-
Demonstration of slot-waveguide structures on silicon nitride / silicon oxide platform
- 2007
-
Ingår i: Optics Express. - 1094-4087. ; 15:11, s. 6846-6856
-
Tidskriftsartikel (refereegranskat)abstract
- We report on the first demonstration of guiding light in vertical slot-waveguides on silicon nitride/silicon oxide material system. Integrated ring resonators and Fabry-Perot cavities have been fabricated and characterized in order to determine optical features of the slot-waveguides. Group index behavior evidences guiding and confinement in the low-index slot region at O-band (1260-1370nm) telecommunication wavelengths. Propagation losses of < 20 dB/cm have been measured for the transverse-electric mode of the slot-waveguides.
|
|
| 5. |
|
|
| 6. |
- Barrios, Carlos, et al.
(författare)
-
Integrated Si3N4/SiO2 Slot-Waveguide Microresonators
- 2007
-
Konferensbidrag (refereegranskat)abstract
- We demonstrate slot-waveguide microring resonators and Fabry-Perot microcavities on Si3N4/SiO2. Characterization indicates guiding and confinement in the waveguide nanometric-size low-index slot region at O-band (1260-1370nm) wavelengths. We measured propagation losses <20 dB/cm.
|
|
| 7. |
|
|
| 8. |
- Giannone, Domenico, et al.
(författare)
-
High Performance Multichannel Photonic Biochip Sensors for Future Point of Care Diagnostics : an Overview on Two EU-Sponsored Projects
- 2010
-
Ingår i: SPIE Proc. 7715 BIOPHOTONICS - PHOTONIC SOLUTIONS FOR BETTER HEALTH CARE II. - : SPIE. - 9780819481887 ; , s. 77150U-1-77150U-12
-
Konferensbidrag (refereegranskat)abstract
- We present here research work on two optical biosensors which have been developed within two separate European projects (6(th) and 7(th) EU Framework Programmes). The biosensors are based on the idea of a disposable biochip, integrating photonics and microfluidics, optically interrogated by a multichannel interrogation platform. The objective is to develop versatile tools, suitable for performing screening tests at Point of Care or for example, at schools or in the field. The two projects explore different options in terms of optical design and different materials. While SABIO used Si(3)N(4)/SiO(2) ring resonators structures, P3SENS aims at the use of photonic crystal devices based on polymers, potentially a much more economical option. We discuss both approaches to show how they enable high sensitivity and multiple channel detection. The medium term objective is to develop a new detection system that has low cost and is portable but at the same time offering high sensitivity, selectivity and multiparametric detection from a sample containing various components (e. g. blood, serum, saliva, etc.). Most biological sensing devices already present on the market suffer from limitations in multichannel operation capability (either the detection of multiple analytes indicating a given pathology or the simultaneous detection of multiple pathologies). In other words, the number of different analytes that can be detected on a single chip is very limited. This limitation is a main issue addressed by the two projects. The excessive cost per test of conventional bio sensing devices is a second issue that is addressed.
|
|
| 9. |
|
|
| 10. |
|
|
| 11. |
|
|
| 12. |
|
|
| 13. |
- Gylfason, Kristinn, 1978-, et al.
(författare)
-
On-chip spectroscopy of CO2 with MIR waveguides
- 2020
-
Ingår i: Optics InfoBase Conference Papers. - : The Optical Society.
-
Konferensbidrag (refereegranskat)abstract
- We review our recent work on spectroscopic sensing of carbon dioxide in the mid-infrarded region around 4.3 µm using suspended silicon waveguides. Our waveguides are built on standard silicon-on-insulator substrates and acheive high sensitivity to gas.
|
|
| 14. |
|
|
| 15. |
|
|
| 16. |
- Holm, Ulf, et al.
(författare)
-
Measurement system for magneto-optic sensor materials
- 1984
-
Ingår i: Journal of Physics E: Scientific Instruments. - : The Institute of Physics. - 0022-3735. ; 17:10, s. 885-889
-
Tidskriftsartikel (refereegranskat)abstract
- A system for the measurements of magneto-optic properties of IR-transparent materials is described. The system is designed for the characterisation of fibre optic magnetic field sensor materials. Measurement results on YIG-crystals are prresented. The accuracy of Faraday rotation and light transmission measurements are ±2 mrad and ±2% respectively. Important features for the sensor characterisation are light beam scanning, temperature control and flexible magnetic field generation. A desktop computer is used for system control and data acquisition. The system is expected to be of great importance for future sensor developments.
|
|
| 17. |
- Holm, Ulf, et al.
(författare)
-
Transmission loss compensation for Faraday effect fibre optic sensors
- 1994
-
Ingår i: SENSORS AND ACTUATORS A-PHYSICAL. - : Elsevier. ; , s. 487-490
-
Konferensbidrag (refereegranskat)abstract
- We present a novel scheme for compensation of transmission loss variations in Faraday effect-based fibre optic magnetic field sensors. Light is sent through the sensing element in opposite directions to form the two signal channels needed for the compensation. Experiments have been made with a time-multiplexed multimode system in which IR emitting diodes are alternately used as emitters and detectors. With transmission loss variations of less than 25%, which is reasonable in a real system, the resulting error is well below 1%.
|
|
| 18. |
- Holm, Ulf, et al.
(författare)
-
YIG-SENSOR DESIGN FOR FIBER OPTICAL MAGNETIC-FIELD MEASUREMENTS
- 1984
-
Ingår i: PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, volume 0514. ; , s. 333-336
-
Konferensbidrag (refereegranskat)abstract
- Aiming at the design of a magnetic field sensor utilizing the Faraday effect, we give in this paper a description of measurements of magneto-optical properties of YIG. We also give sensor design rules based upon these measurements.
|
|
| 19. |
|
|
| 20. |
- Maire, Guillaume, et al.
(författare)
-
High efficiency silicon nitride surface grating couplers
- 2008
-
Ingår i: Optics Express. - 1094-4087. ; 16:1, s. 328-333
-
Tidskriftsartikel (refereegranskat)abstract
- High efficiency surface grating couplers for silicon nitride waveguides have been designed, fabricated, and characterized. Coupling efficiencies exceeding 60 % are reported at a wavelength of 1.31 mu m, as well as angular and wavelength -3 dB tolerances of 4 and 50 nm, respectively. When the wavelength is increased from 1310 nm to 1450 nm the coupling efficiency progressively decreases but remains above 20 % at 1450 nm. The influence of the duty ratio of the grating has also been investigated: maximum coupling efficiency was obtained at 50 % duty ratio.
|
|
| 21. |
|
|
| 22. |
- Ottonello Briano, Floria, et al.
(författare)
-
Carbon dioxide absorption spectroscopy with a mid-infrared silicon photonic waveguide
- 2020
-
Ingår i: Optics Letters. - : OSA - The Optical Society. - 0146-9592 .- 1539-4794. ; 45:1, s. 109-112
-
Tidskriftsartikel (refereegranskat)abstract
- Carbon dioxide (CO2) is a gas vital for life on Earth. It is also a waste product of human activities and is widely used in agriculture and industry. Its accurate sensing is therefore of great interest. Optical sensors exploiting the mid-infrared light absorption of CO2 provide high selectivity, but their large size and high cost limit their use. In this Letter, we demonstrate CO2 gas sensingat 4.2 μm wavelength using an integrated silicon waveguide, featuring a sensitivity to CO2of 44% that of free-space sensing. The suspended waveguide is fabricated on a silicon-on-insulator substrate by a single-lithography-step process, and we route it into a mid-infrared photonic circuit for on-chip-referenced gas measurements. Its demonstrated performance and its simple and scalable fabrication make our waveguide ideal for integration in miniaturized CO2 sensors for distributed environmental monitoring, personal safety, and medical and high-volume consumer applications. © 2019 Optical Society of America.
|
|
| 23. |
|
|
| 24. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
A fibre optic displacement sensor
- 1982
-
Ingår i: Acta IMEKO. - Budapest : Akadémiai Kiadó. ; , s. 51-60
-
Konferensbidrag (refereegranskat)abstract
- Fibre optics is beginning to find use for sensing purposes. Fibre optic sensors have many interesting features, e.g., their immunity to interference from electromagnetic fields. The paper briefly discusses different sensor principles. A displacement sensor using multimode, step index fibres is desccribed. Measurement data showing a resolution of 0.05 nm/sqrt(Hz) in a 150 µm linear range is given. In this sensor, the light coupling between two fibre ends varies with the position of a movable mirror. A mathematical model of the sensor is presented. Application to pressure sensing is also discussed.
|
|
| 25. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
A Polarization Based Fibre Optical Sensor System Using a YIG Optical Waveguide for Magnetic Field Sensing
- 1989
-
Ingår i: Springer Proceedings in Physics, vol 44.. - : Springer-Verlag. - 3540517197 - 0387517197 ; , s. 273-278
-
Konferensbidrag (refereegranskat)abstract
- A sensor system utilizing a polarization maintaining fibre for the optical signal transmission and a planar optical waveguide for magnetic field measurements is presented. The system is based on polarization modulation originating from the TE to TM mode conversion in a magneto-optical thin film of Gd,Ga substituted YIG (Yttrium Iron Garnet).
|
|
| 26. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
A waveguide-based fiber optic magnetic field sensor with directional sensitivity
- 1991
-
Ingår i: SPIE - The International Society for Optical Engineering, vol. 1511. - Bellingham, WA, United States : Int Soc for Optical Engineering. - 0819406201 ; , s. 142-148
-
Konferensbidrag (refereegranskat)abstract
- Design and performance of an extrinsic guided wave fiber optic magnetic field sensor is reported. The sensor utilizes a substituted YIG (yttrium iron garnet, Y3Fe5O12) thin film as the waveguiding sensing element. A polarization maintaining fiber downlead was used to provide insensitivity to both power and loss fluctuations. The design makes it possible to determine both the magnitude and the sign of the magnetic field. Measurement results indicate a usable measurement range of at least several mT with a noise equivalent magnetic field level of less than 8 nT/√Hz
|
|
| 27. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
Characterization of Magneto-optical Thin Films for Sensor Use
- 1989
-
Ingår i: SPIE Proceedings Electro-Optic and Magneto-Optic Materials and Applications, vol. 1126. - 9780819401625 ; , s. 77-84
-
Konferensbidrag (refereegranskat)abstract
- As a part of a fibre optical sensor development project we have made an evaluation of different optical waveguiding techniques to study the properties of thin magnetooptical films. Because of the application the methods are focused on the determination of the Faraday rotation, the linear birefringence and the dynamics and anisotropy of the magnetic properties of the samples. Measurements using holographic grating, prism and edge (end-fire) light coupling to different substituted YIG films are presented. The advantages of the different methods are discussed and it is shown that the launching technique may affect the properties to be measured. Film stress caused by the prism coupling method is found to influence the magnetic anisotropy.
|
|
| 28. |
|
|
| 29. |
- Sohlström, Hans, 1952-
(författare)
-
Fibre Optic Magnetic Field Sensors Utilizing Iron Garnet Materials
- 1993
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis deals with the subject of fibre optic magnetic field sensors utilizing iron garnet materials. Such materials exhibit a large Faraday rotation which make them advantageous for application in compact magnetic field sensors. After an introduction, in which fibre optic sensors and optical methods to measure electric current are reviewed, the original research work is summarized. A system for the measurement of the magneto-optic properties of transparent materials is described. Measurement results, showing the influence of temperature, magnetic field direction and sample treatment on the magneto-optical properties of YIG-crystals, are presented. The properties of thin magneto-optical waveguiding films have also been studied using different light coupling methods. Measurement results obtained for holographic grating, prism and edge (end-fire) light coupling to different substituted YIG films are presented. It is shown that the launching method may affect the properties to be measured. The design and performance of several versions of extrinsic guided wave fibre optic magnetic field sensors are then reported. The sensors employ substituted YIG (Yttrium Iron Garnet, Y3Fe5O12) thin film waveguides as sensing elements. Polarization maintaining fibres were used as feed and return to provide two signal channels. The signals were combined in a balanced measurement system, providing insensitivity to both fluctuations in optical power and loss. Sensors have been made both with separate fibres to guide the light to and from the sensing element and with a single fibre for both functions. The two fibre version, although less ”elegant”, is found to have a better performance. This version also makes it possible to determine both the magnitude and sign of the magnetic field. Measurement results indicate a usable measurement range of at least several mT with a noise equivalent magnetic field level of less than 8 nT/root(Hz). The design and performance of multimode fibre optic magnetic field sensors utilizing the Faraday effect in an epitaxially grown thick (YbTbBi)IG film is also described. This type of sensor is found to be linear over a range from 27 mT to less than 270 nT. Sensor prototypes suitable for current monitoring in high voltage transmission lines have also been developed.
|
|
| 30. |
- Sohlström, Hans, 1952-
(författare)
-
Highly sensitive lab-on-chip for rapid diagnosis
- 2010
-
Ingår i: SPIE Newsroom. - : SPIE. - 1818-2259.
-
Annan publikation (populärvet., debatt m.m.)abstract
- Accurate extraction of optical signals and multiple sensors on a single optical chip enable low-cost detection of specific proteins at the doctor's desk.
|
|
| 31. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
Refractive Index Measurement Using Integrated Ring Resonators
- 1997
-
Ingår i: ECIO '97: proceedings, 8th European Conference on Integrated Optics and technical exhibition. - Stockholm : Institute of Optical Research. - 9171701524 - 9789171701527 ; , s. 322-325
-
Konferensbidrag (refereegranskat)abstract
- The resonance wavelength of optical ring resonators depend on the index of the waveguide cover. Using silicon nitride guides we demonstrate an index resolution of 5·10^–6.
|
|
| 32. |
- Sohlström, Hans, 1952-, et al.
(författare)
-
The Performance Of A Fiber Optic Magnetic-Field Sensor Utilizing A Magnetooptical Garnet
- 1992
-
Ingår i: Fiber and integrated optics (Print). - : Taylor & Francis. - 0146-8030 .- 1096-4681. ; 11:2, s. 135-139
-
Tidskriftsartikel (refereegranskat)abstract
- The design and performance of a multimode fiber optic magnetic field sensor utilizing the Faraday effect in an epitaxially grown thick (YbThBi)IG film is reported. The sensor is found to be linear over a range of more than lOO dB.
|
|
| 33. |
|
|
| 34. |
- Stemme, Göran, 1958-, et al.
(författare)
-
Three dimensional alignment method and system
- 2002
-
Patent (populärvet., debatt m.m.)abstract
- A system for achieving fixation of one or more moveable micro machined platforms for passively aligned optical components, comprising - a support structure containing structures for passive alignment of optical components- platforms containing structures for passive alignment of optical components- actuators for actively aligning the already passively aligned components on the platforms and the support structure to each other, where the actuators are strong enough while actuating to keep the platforms steady during fixation and weak enough while not actuating so as not to impede the fixation- a fixation mechanism to fixate the moveable platforms to the support structure.
|
|
| 35. |
|
|
| 36. |
- Thorsén, Anders, et al.
(författare)
-
Summit RF MEMS packaging
- 2004
-
Ingår i: Fifth Micro Structure Workshop (MSW 2004).
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)
|
|
| 37. |
- Vivien, Laurent, et al.
(författare)
-
A high efficiency silicon nitride grating coupler
- 2007
-
Ingår i: 2007 4th IEEE International Conference on Group IV Photonics. - : IEEE. - 9781424409341 ; , s. 157-159
-
Konferensbidrag (refereegranskat)abstract
- The experimental demonstration of a high efficiency silicon nitride grating coupler is reported for wavelengths from lambda=1.25 to 1.45 mu m for TE polarization. At the resonant angle, a coupling efficiency higher than 60% has been measured.
|
|
