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Integrated photonics with 2D materials
Two-dimensional (2D) materials are a group of layered materials that show great potential
for on-chip optoelectronic devices. The unique feature of these materials is the possibility to assemble different 2D materials into a vertical heterostructure to form for example light emitting devices.
Two-dimensional (2D) materials are a group of layered materials that show great potential for on-chip optoelectronic devices [1]. The unique feature of these materials is the possibility to assemble different 2D materials into a vertical heterostructure to form for example light emitting devices [2] and high-speed photodetectors [3].
For on-chip photonics they can be cointegrated with dielectric waveguides and resonators. In these waveguides and resonators the highest field intensity is found inside the light confining dielectric medium. Optimal mode overlap can consequently be realized by integration of the active materials inside the dielectric photonic structures. Using the 2D material hexagonal boron nitride (h-BN) as dielectric, we recently sandwiched an emitter inside waveguide-coupled disk resonators at highest field intensities (see figure (a)) [4].
The goal of this project is to now further characterize other resonators made of h-BN, with a focus on photonic crystal cavities. To optimize the device performance, geometrical design parameters have to be identified. As a starting point of the project, recent results on h-BN photonic resonators can be used (see figure (b)) [5]. The designed resonators will then be fabricated and investigated in an optical measurement setup.
Overall the student will: 1) Simulate the resonators (e.g. COMSOL). 2) Fabricate the structures with typical process steps like exfoliation of 2D materials and dry etching in the FIRST clean room. 3) Perform measurements (e.g. record spectra) in an optical measurement setup.
References:
[1] K. Mak, J. Shan, Nature Photon 10, 216–226 (2016).
[2] M. Parzefall et al., Nat. Commun. 10, 292 (2019).
[3] N. Flöry et al., Nat. Nanotechnol. 15, 118-124 (2020).
[4] R. Khelifa et al., Nano Letters 20, 6155-6161 (2020).
[5] S. Kim et al., Nat. Commun. 9, 2623 (2018).
Prerequisites:
Practical lab skills, basic programming skills for data analysis and basic
knowledge on electromagnetic fields.
Two-dimensional (2D) materials are a group of layered materials that show great potential for on-chip optoelectronic devices [1]. The unique feature of these materials is the possibility to assemble different 2D materials into a vertical heterostructure to form for example light emitting devices [2] and high-speed photodetectors [3]. For on-chip photonics they can be cointegrated with dielectric waveguides and resonators. In these waveguides and resonators the highest field intensity is found inside the light confining dielectric medium. Optimal mode overlap can consequently be realized by integration of the active materials inside the dielectric photonic structures. Using the 2D material hexagonal boron nitride (h-BN) as dielectric, we recently sandwiched an emitter inside waveguide-coupled disk resonators at highest field intensities (see figure (a)) [4]. The goal of this project is to now further characterize other resonators made of h-BN, with a focus on photonic crystal cavities. To optimize the device performance, geometrical design parameters have to be identified. As a starting point of the project, recent results on h-BN photonic resonators can be used (see figure (b)) [5]. The designed resonators will then be fabricated and investigated in an optical measurement setup. Overall the student will: 1) Simulate the resonators (e.g. COMSOL). 2) Fabricate the structures with typical process steps like exfoliation of 2D materials and dry etching in the FIRST clean room. 3) Perform measurements (e.g. record spectra) in an optical measurement setup.
References: [1] K. Mak, J. Shan, Nature Photon 10, 216–226 (2016). [2] M. Parzefall et al., Nat. Commun. 10, 292 (2019). [3] N. Flöry et al., Nat. Nanotechnol. 15, 118-124 (2020). [4] R. Khelifa et al., Nano Letters 20, 6155-6161 (2020). [5] S. Kim et al., Nat. Commun. 9, 2623 (2018).
Prerequisites: Practical lab skills, basic programming skills for data analysis and basic knowledge on electromagnetic fields.