Dr. Jakob Janting
Technical University of Denmark, Department of Photonics Engineering
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Academic Career Length
37Years (1990-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications4 March 2019 in Journal of Lightwave Technology
Journal Article
Jakob JantingJPJens K. M. Pedersen
Jens K. M. PedersenGWGetinet Woyessa
Getinet WoyessaKNKristian Nielsen
Kristian NielsenOBOle Bang
Ole BangThe smallest all-polymer optical fiber Bragg grating based transducer element for pH sensing is presented. We show that, considering it's size and robustness, it out-performs similar state-of-the-art fiber Bragg grating based pH sensors regarding both sensitivity and response time. A 5 μm - 10 μm thick pH sensitive hydrogel coating is placed on a PMMA based microstructured Polymer Optical Fiber Bragg Grating (mPOFBG). The hydrogel expands or contracts depending on the pH and thus changes in pH are monitored by following the fiber strain induced changes in the reflected Bragg wavelength $\lambda_B$ . Prior to applying the hydrogel coating the mPOF is etched from 150 μm to 80 μm to enhance sensitivity and surface crazing is introduced with a 50/50 vol% solution of acetone and methanol to enhance spreading of the hydrogel during the application and adhesion after cure. With this design we achieved a sensitivity of $\Delat\lambda_B = 73 {\rm pm/pH}$ ±2 pm/pH and response times below 4.5 mins. for pH 5 - 7 and 4 - 7 respectively and a thermal cross sensitivity of 31.4 pm/°C ± 0.4 pm/°C.
Journal Article
In this paper, we present numerical and experimental results on Localized Surface Plasmon Resonance (LSPR) refractive index (RI) sensitivity, Figure of Merit (FoM), and penetration depth (dp) dependence on spherical gold nanoparticles (AuNPs) size, and the effects of AuNP dimer interparticle distance (ds) studied numerically. These parameters were calculated and observed for d = 20, 40, 60, 80, and 100 nm diameter spherical AuNPs. Our investigation shows d = 60 nm AuNPs give the best FoM. The AuNP dimer interparticle distance can significantly influence the RI sensitivity. Therefore, the effect of distances between pairs of d = 20 nm and 60 nm AuNPs is shown. We discuss the importance of penetration depth information for AuNPs functionalized with aptamers for biosensing in the context of aptamer size.
20 December 2018 in Journal of the Optical Society of America B
Journal Article
MDManoj Kumar Dasa
Manoj Kumar DasaCMChristos Markos
Christos MarkosJakob JantingOBOle Bang
Ole BangAccurate monitoring of glucose levels constitutes the most important parameter for diabetes management and treatment planning. In this work, we report on an in vitro glucose monitoring system based on multispectral photoacoustic sensing (MSPAS) using a cost-effective supercontinuum (SC) laser. We demonstrate for the first time, to the best of our knowledge, how the use of a broadband SC source allows the identification of distinct absorption characteristics of two major analytes (glucose and cholesterol) present in the human body in the extended near-infrared 1540–1840 nm spectral range. Employing the reported SC-based MSPAS system with a ratiometric analysis, we were able to accurately (coefficient of determination ) measure a wide range of glucose concentration levels in vitro. We further demonstrate clinically accurate prediction of glucose concentrations over commonly encountered physiological levels inside the human body (0–400 mg/dL) with reference to a Clarke error grid analysis. These findings pave the way for devising potentially noninvasive and label-free continuous glucose monitoring systems.
1 June 2017 in Optics Letters
Journal Article
XHXuehao Hu
Xuehao Hu
GWGetinet Woyessa
Getinet WoyessaDKDamien Kinet
Damien Kinet
Jakob JantingKNKristian Nielsen
Kristian Nielsen
Christophe Caucheteur +1
An endlessly single-mode doped microstructured poly(methyl methacrylate) (PMMA) optical fiber is produced for effective fiber Bragg grating (FBG) photo-inscription by means of a 400 nm femtosecond pulsed laser and the phase mask technique. The fiber presents a uniform benzyl dimethyl ketal (BDK) distribution in its core without drastic loss increase. It was produced using the selected center hole doping technique, and the BDK dopant acts as a photoinitiator. In this Letter, we report a rapidly growing process of the grating reflection band. For an 11 mW mean laser power, the FBG reflectivity reaches 83% in only 40 s.
22 March 2019 in IEEE Transactions on Device and Materials Reliability
Journal Article
Jakob JantingJTJulie Grundtvig Theander
Julie Grundtvig Theander
HEHenrik Egesborg
Henrik EgesborgAn empirical rule, the 10 ∘C rule, states that chemical reaction rates are doubled for every 10 ∘C temperature increase. This is often used in thermally accelerated medical device polymer aging studies. Here, theoretical evidence and limitations for the rule are analyzed. Thus, a new more accurate rule based on averaging Arrhenius chemical reaction rate ratios over typical activation energies 0.1 eV -0.9 eV in the normal medical device accelerated test temperature interval 25 ∘C -70 ∘C is proposed. Comparison with the 10 ∘C rule shows that the 10 ∘C rule provides similar estimates, but only at the reference temperature 25 ∘C. Fitting the reaction rate ratio based on the Arrhenius equation using the reference temperature 25 ∘C to the 10 ∘C rule data reveals that best agreement is achieved with a thermal aging activation energy of 0.67 eV.
6 March 2017 in IEEE Photonics Technology Letters
Journal Article
AFAndrea Fasano
Andrea FasanoGWGetinet Woyessa
Getinet WoyessaJakob JantingHRHenrik K. Rasmussen
Henrik K. RasmussenOBOle Bang
Ole BangIn this letter, we investigate the response of poly(methylmethacrylate) (PMMA) microstructured polymer optical fiber Bragg gratings (POFBGs) after immersion in methanol/water solutions at room temperature. As the glass transition temperature of solution-equilibrated PMMA differs from the one of solvent-free PMMA, different concentrations of methanol and water lead to various degrees of frozen-in stress relaxation in the fiber. After solvent evaporation, we observe a permanent blue-shift in the grating resonance wavelength. The main contribution in the resonance wavelength shift arises from a permanent change in the size of the fiber. The results are compared with conventional annealing. The proposed methodology is cost-effective as it does not require a climate chamber. Furthermore, it enables an easy-to-control tuning of the resonance wavelength of POFBGs.
About Me
Jakob Janting received the M.Sc. degree in materials science from the University of Aarhus, Denmark, in 1991 and the Ph.D. degree in 2008 for the thesis entitled “Reliability of Polymer Adhesive and Coating Materials for Microsystem Packaging.” He was a Researcher with the Tribology Department, University of Aarhus, from 1991 to 1994 in an EU project, where he was researching micro focus X-ray strain measurements. In 1994, he joined the Department for Sensors, Grundfos Research, where he worked in a National Project on Materials for advanced MEMS sensor packaging. From 1998 to 2011, he was employed with DELTA Danish Electronics, Light, and Acoustics, with a focus on polymer microsystem encapsulation. From 2011 to 2015, he was with Medtronic, where he researched reliable packaging of an on-body combined electrochemical and fiber-optical microsensor device for continuous blood glucose monitoring and insulin delivery. He was a Postdoctoral Fellow in 2015, Researcher in 2017 and Senior Researcher 2020 with the Fiber Sensors and Supercontinuum Group, the Department of Photonics Engineering, Technical University of Denmark, where he is currently focusing on microstructured polymer optical fiber bio/chemical sensors.