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Zhu, Haoyu (author), Özkayar, G. (author), Lötters, J.C. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Organ-on-a-chip (OoC) devices require the precise control of various media. This is mostly done using several fluid control components, which are much larger than the typical OoC device and connected through fluidic tubing, i.e., the fluidic system is not integrated, which inhibits the system’s portability. Here, we explore the limits of...journal article 2023
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Özkayar, G. (author), Wang, Z. (author), Lötters, J.C. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Reciprocating piezoelectric micropumps enable miniaturization in microfluidics for lab-on-a-chip applications such as organs-on-chips (OoC). However, achieving a steady flow when using these micropumps is a significant challenge because of flow ripples in the displaced liquid, especially at low frequencies or low flow rates (<50 µL/min)....journal article 2023
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Özkayar, G. (author), Lötters, J.C. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Piezoelectric micropumps enable miniaturization in microfluidics for lab-on-a-chip applications such as Organs-on-chips (OoC). However, achieving a steady flow with these micropumps is a significant challenge because of the reciprocating motion of the displacing component. Although dampers are widely preferred for reducing ripples, they are not...conference paper 2022
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Zhang, Y. (author), Tichem, M. (author), van Keulen, A. (author)Metastructures composed of snapping beams are capable of deforming into a series of stable states, enabling them to realize shape reconfigurations. In this paper, we present the design of a metastructure-based morphing surface that is able to exhibit a series of stable configurations with different curvatures. Using theoretical, numerical,...journal article 2022
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Aghajani, S. (author), Accardo, A. (author), Tichem, M. (author)One of the essential requirements to create nanoparticle (NP)-based applications and functions is the ability to control their deposition in specific locations. Many methods have been proposed, with wet direct writing (DW) techniques such as inkjet printing being the most employed. These methods generally depend on off-line and solvent-based...journal article 2022
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Özkayar, G. (author), Lötters, J.C. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Microfluidic organs-on-chips (OoCs) technology has emerged as the trend for in vitro functional modeling of organs in recent years. Simplifying the complexities of the human organs under controlled perfusion of required fluids paves the way for accurate prediction of human organ functionalities and their response to interventions like...review 2022
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Aghajani, S. (author), Accardo, A. (author), Tichem, M. (author)The ability to tune the localised surface plasmon resonance (LSPR) behaviour of metal nanostructures has great importance for many optical sensor applications such as metal (plasmon) enhanced fluorescence spectroscopy and surface-enhanced Raman scattering (SERS). In this paper, we used Aerosol Direct Writing (ADW) to selectively deposit fine...journal article 2021
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Zhang, Y. (author), Tichem, M. (author), van Keulen, A. (author)Multi-stable metastructures composed of curved beams can switch to a series of stable configurations via elastic snap-through transitions. The elastic deformations allow metastructures to function as reusable energy absorbers. However, conventional metastructure designs based on solid beams often result in relatively low energy dissipation....journal article 2021
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Zhang, Y. (author), Tichem, M. (author), van Keulen, A. (author)Metastructures consisting of planar arrangements of bi-stable snap-through beams are able to exhibit multiple stable configurations. Apart from the expected translational state transition, when all beam elements snap through, rotational states may exist as well. In this paper we explore the rotational properties of multi-stable metastructures...journal article 2021
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Aghajani, S. (author), Accardo, A. (author), Tichem, M. (author)Surface-enhanced Raman scattering (SERS) substrates are of great interest for detecting low-concentrated analytes. However, issues such as multistep processing, cost, and possible presence of hazardous substances in the fabrication still represent a significant drawback. In this paper, an innovative direct writing method is introduced for...journal article 2020
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Zhang, Y. (author), Wang, Q. (author), Tichem, M. (author), van Keulen, A. (author)Multi-stable structures are able to achieve significant geometric change and retain specific deformed configurations after the loads have been removed. This reconfiguration property enables, for example, to design metamaterials with tunable features. In this work, a type of multi-stable metastructures exhibiting both level and tilted stable...journal article 2020
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Gunda, Arun (author), Özkayar, G. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Microvalves are important flow-control devices in many standalone and integrated microfluidic applications. Polydimethylsiloxane (PDMS)-based pneumatic microvalves are commonly used but they generally require large peripheral connections that decrease portability. There are many alternatives found in the literature that use Si-based microvalves,...journal article 2020
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Gunda, Arun (author), Özkayar, G. (author), Tichem, M. (author), Ghatkesar, M.K. (author)Microvalves are important flow-control components in many standalone and integrated microfluidic circuits. Although there is a large body of work regarding<br/>microvalves, there is still a need for an easyto-fabricate, small-footprint, low-power device that can control both liquids and gases at moderate pressures. This paper details the...conference paper 2019
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- Zhang, Y. (author), Wang, Q. (author), Tichem, M. (author), van Keulen, A. (author) abstract 2018
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Tichem, M. (author), Peters, T.J. (author), Wu, K. (author)Recent decades have seen impressive developments in the field of integrated<br/>photonics. Chips with complex photonic functionality can presently be designed<br/>and fabricated. Photonic packages consist of one or more PICs, as well as other<br/>(micro-optical) components, and a fibre (array) to establish the external optical<br/>interface. A...journal article 2018
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Wu, K. (author), Tichem, M. (author)Photonic packaging, which includes high-precision assembly of photonic sub-systems, is currently a bottleneck in the development of commercially-available integrated photonic products. In the pursuit of a fully-automated, high-precision, and cost-effective photonic alignment scheme for two multi-channel photonic chips, this paper explores...journal article 2018
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Tichem, M. (author), Offermans, G.T.A.E. (author)Nanotechnology has been and still is a ‘hot’ research topic, and the Netherlands<br/>have a forefront position in the scientific field. The expectation is that nano will be<br/>fuelling new applications and functionalities. Time has come to exploit the<br/>potential and create real impact in industry and society. To this end, TU Delft has<br/...journal article 2017
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Peters, T.J. (author), Tichem, M. (author)In this paper, we present positionable photonic waveguide arrays that are developed for optical chip-to-chip alignment. Partly suspended photonic structures, based on the Si3N4/SiO2 material platform, are equipped with thermal actuators enabling the free end of the structures to be positioned with submicrometer accuracy. A finite-element model...journal article 2017
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- Fanzio, P. (author), Tichem, M. (author), Staufer, U. (author), Sasso, L. (author) abstract 2016
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Peters, T.J. (author), Tichem, M. (author)This paper describes the design, fabrication and characterization of electrothermal bimorph actuators consisting of polysilicon on top of thick (>10 μm ) silicon dioxide beams. This material platform enables the integration of actuators with photonic waveguides, producing mechanically-flexible photonic waveguide structures that are...journal article 2016
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