A5047886465- Phase-change materials and chalcogenides
- Photonic and Optical Devices
- Advanced Optical Imaging Technologies
- Liquid Crystal Research Advancements
- Photorefractive and Nonlinear Optics
- Advanced Memory and Neural Computing
- Photonic Crystals and Applications
Northeast Normal University
2025
Shanghai Jiao Tong University
2017-2020
Optical memristive switches can be used as optical latching in which the switching state is changed only by applying an electrical Write/Erase pulse and maintained without external power supply. We demonstrate switch based on a silicon multimode interferometer structure covered with nanoscale-sized Ge2Sb2Te5 (GST) material top. The phase change of GST triggered resistive heating layer beneath pulse. Experimental results reveal that transmissivity tuned controllable repeatable manner. Partial...
Phase change materials combined with silicon photonics are emerging as a promising platform to realize miniature photonic devices. We study the basic optical properties of subwavelength-dimension ridge waveguide 20-nm-thick Ge2Sb2Te5 (GST) top-clad layer. Numerical simulations show that effective index Si-GST hybrid varies significantly when GST changes from amorphous crystalline states. This can be utilized make micron-size To experimentally verify effectiveness on light wave manipulation,...
Layered gallium sulfide (GaS), a material that has attracted much attention in the field of micro-nano optoelectronics recently, is predicted to have four stable stacking orders (β-, γ-, ε-, and δ-GaS) with close formation energies; β-GaS most considered, other phases are seldom discussed. However, considering ease phase transition few-layer materials, lack accurate crystal identification prevents full understanding this for specific applications requiring phases. Here, we report novel situ...
We present a Ge2Sb2Te5 (GST)-integrated ring resonator with the tuning enabled by an all-optical phase change of GST using sequence optical pulses. The is non-volatile and repeatable, no static power consumption due to "self-holding" feature phase-change material. 2 μm long can be partially crystallized controlling number pulses, increasing freedom. coupling between bus waveguide based on asymmetric Mach–Zehnder interferometer. strength wavelength-dependent, so that optimal wavelength...
In the following study, we propose optical memristive switches consisting of a silicon waveguide integrated with phase-change material Ge2Sb2Te5 (GST). Thanks to its high refractive index contrast between crystalline and amorphous states, miniature-size GST can offer switching extinction ratio. We optimize device design by using finite-difference-time-domain (FDTD) simulations. A length 4.7 μm including tapers exhibits ratio 33.1 dB low insertion loss 0.48 around 1550 nm wavelength. The...
This paper reports on the design optimization of compact optical ON-OFF switches based a GST-clad silicon rib waveguide and compares it to nanowire at telecommunication wavelength 1.55 µm.Effective index modal loss quasi-TE modes are calculated by full-vectorial H-field finite element method.It shows that electro-refraction effect-based switch may not be viable because higher in GST crystalline state.On other hand, larger difference between amorphous states would more suitable for an...
We present the design, simulation, and experimental demonstration of a Si-GST grating assisted contra-directional coupler for optical switching. The effective refractive index GST-loaded silicon waveguide changes significantly when GST is switched from amorphous state to crystalline state, allowing large tuning propagation constant. two coupled waveguides are designed satisfy phase-match condition only at achieve Bragg reflection drop-port. Experimental results show that device insertion...
We report a silicon optical nanobeam resonator with central hole infiltrated thin layer of Ge2Sb2Te5 (GST) material. The resonances can be tuned when the GST changes its phases between amorphous and crystalline states.