Searched for: author%3A%22Westerveld%2C+W.J.%22
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Chang, Li Fu (author), Norte, R.A. (author), Westerveld, W.J. (author), Tseng, Shuo Yen (author)
Efficient coupling of light from an optical fiber to silicon waveguides is a challenging task in integrated photonics. Couplers based on adiabatic mode evolution have the advantages of high bandwidth and low loss but are often accompanied by longer device lengths. In this paper, we introduce the concept of adiabaticity map and optimize the...
conference paper 2023
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Erdoğan, R.T. (author), Filonenko, G.A. (author), Picken, S.J. (author), Steeneken, P.G. (author), Westerveld, W.J. (author)
Ultrasound is widely used in medical imaging, and photo-acoustics is an upcoming imaging modality for the diagnosis of diseases. Future applications require a large matrix of small, sensitive, and broadband ultrasound sensors. However, current high-end systems still use piezo-electric material to detect ultrasound, with limited sensitivity...
conference paper 2023
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Westerveld, W.J. (author)
abstract 2022
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Pieters, Cedric (author), Westerveld, W.J. (author), Mahmud-Ul-Hasan, Hasan (author), Severi, Simone (author), Kjellman, Jon (author), Jansen, Roelof (author), Rochus, Veronique (author), Rottenberg, Xavier (author)
Photoacoustic tomography defines new challenges for ultrasound detection compared to ultrasonography. To address these challenges, a sensitive, small, scalable, and broadband optomechanical ultrasound sensor (OMUS) has been developed. The OMUS is an on-chip optical ultrasound sensor, using optical interferometric ultrasound detection. It...
conference paper 2022
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Pieters, Cedric (author), Westerveld, W.J. (author), Mahmud-Ul-Hasan, Md. (author), Severi, Simone (author), Shnaiderman, Rami (author), Ntziachristos, Vasilis (author), Billen, Margo (author), Kjellman, Jon (author), Jansen, Roelof (author), Rochus, Veronique (author), Rottenberg, Xavier (author)
We propose a new opto-mechanical ultrasound sensor (OMUS) enabled by an innovative silicon photonics waveguide. We present experimental results up to 30 MHz, a 10-sensor array proof-of-concept and our latest findings.
conference paper 2021
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Leinders, S.M. (author), Westerveld, W.J. (author), Pozo, J. (author), Neer, P.L.M.J. (author), Snyder, B. (author), O'Brien, P. (author), Urbach, H.P. (author), de Jong, N. (author), Verweij, M.D. (author)
With the increasing use of ultrasonography, especially in medical imaging, novel fabrication techniques together with novel sensor designs are needed to meet the requirements for future applications like three-dimensional intercardiac and intravascular imaging. These applications require arrays of many small elements to selectively record the...
journal article 2015
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Westerveld, W.J. (author)
We demonstrated that photonic micro-ring resonators can be used in micro-machined ultrasound microphones. This might cause a breakthrough in array transducers for ultrasonography; first because optical multiplexing allows array interrogation via one optical fiber and second because the silicon-on-insulator technology allows cost-effective...
doctoral thesis 2014
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Westerveld, W.J. (author), Pozo, J. (author), Leinders, S.M. (author), Yousefi, M. (author), Urbach, H.P. (author)
We investigate directional couplers in silicon-on-insulator photonic technology. We theoretically and experimentally demonstrate a large coupling-induced phase delay that occurs when nearly all light is coupled from one waveguide to the other, i.e., when the coupler operates as a cross-coupler. We show that even a tiny asymmetry in the two...
journal article 2013
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Westerveld, W.J. (author), Leinders, S.M. (author), Muilwijk, P.M. (author), Pozo, J. (author)
Microscale strain gauges are widely used in micro electro-mechanical systems (MEMS) to measure strains such as those induced by force, acceleration, pressure or sound. We propose all-optical strain sensors based on micro-ring resonators to be integrated with MEMS. We characterized the strain-induced shift of the resonances of such devices....
journal article 2013
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Westerveld, W.J. (author), Leinders, S.M. (author), Van Dongen, K.W.A. (author), Urbach, H.P. (author), Yousefi, M. (author)
Marcatili's famous approximate analytical description of light propagating through rectangular dielectric waveguides, published in 1969, gives accurate results for low-index-contrast waveguides. However, photonic integrated circuit technology has advanced to high-index-contrast (HIC) waveguides. In this paper, we improve Marcatili's model by...
journal article 2012
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Westerveld, W.J. (author), Pozo, J. (author), Harmsma, P.J. (author), Schmits, R. (author), Tabak, E. (author), Van den Dool, T.C. (author), Leinders, S.M. (author), Van Dongen, K.W.A. (author), Urbach, H.P. (author), Yousefi, M. (author)
Recently there has been growing interest in sensing by means of optical microring resonators in photonic integrated circuits that are fabricated in silicon-on-insulator (SOI) technology. Taillaert et al. [Proc. SPIE6619, 661914 (2007)PSISDG0277-786X10.1117/12.738412] proposed the use of a silicon-waveguide-based ring resonator as a strain gauge....
journal article 2012
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Westerveld, W.J. (author), Urbach, H.P. (author), Yousefi, M. (author)
We present an accurate and fast 3D simulation scheme for out-of-plane grating couplers, based on two dimensional rigorous (finite difference time domain) grating simulations, the effective index method (EIM), and the Rayleigh-Sommerfeld diffraction formula. In comparison with full 3D FDTD simulations, the rms difference in electric field is...
journal article 2011
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van Zeijl, E. (author), Schmits, R. (author), van den Berg, J. H. (author), Harmsma, P. J. (author), Westerveld, W.J. (author), Lagioia, M. (author), Bodis, P. (author), Ebeling, R. P. (author), Nieuwland, R. A. (author), Yang, S. (author)
We present a platform for the deployment of SOI based sensors in commercial<br/>applications. The platform is designed from a systems perspective and includes all<br/>aspects of a SOI sensor system, including sensor head itself, the communications<br/>infrastructure and a customized interrogation system.
conference paper 2010
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