High-performance reconfigurable meta-optics based on optical phase change materials (Rising Researcher) (Conference Presentation)

2020 ◽  
Author(s):  
Tian Gu ◽  
Mikhail Shalaginov ◽  
Sensong An ◽  
Sawyer D. Campbell ◽  
Yifei Zhang ◽  
...  
Keyword(s):  
Phase Change ◽  
High Performance ◽  
Phase Change Materials ◽  
Optical Phase

scholarly journals Broadband transparent optical phase change materials for high-performance nonvolatile photonics

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Yifei Zhang ◽  
Jeffrey B. Chou ◽  
Junying Li ◽  
Huashan Li ◽  
Qingyang Du ◽  
...  
Keyword(s):  
Phase Change ◽  
High Performance ◽  
Phase Change Materials ◽  
Contrast Ratio ◽  
Optical Loss ◽  
Photonic Devices ◽  
Light Modulator ◽  
Optical Phase ◽  
New Class ◽  
Integrated Optical

Abstract Optical phase change materials (O-PCMs), a unique group of materials featuring exceptional optical property contrast upon a solid-state phase transition, have found widespread adoption in photonic applications such as switches, routers and reconfigurable meta-optics. Current O-PCMs, such as Ge–Sb–Te (GST), exhibit large contrast of both refractive index (Δn) and optical loss (Δk), simultaneously. The coupling of both optical properties fundamentally limits the performance of many applications. Here we introduce a new class of O-PCMs based on Ge–Sb–Se–Te (GSST) which breaks this traditional coupling. The optimized alloy, Ge2Sb2Se4Te1, combines broadband transparency (1–18.5 μm), large optical contrast (Δn = 2.0), and significantly improved glass forming ability, enabling an entirely new range of infrared and thermal photonic devices. We further demonstrate nonvolatile integrated optical switches with record low loss and large contrast ratio and an electrically-addressed spatial light modulator pixel, thereby validating its promise as a material for scalable nonvolatile photonics.

Transient Tap Couplers for Wafer-Level Photonic Testing Based on Optical Phase Change Materials

ACS Photonics ◽  
2021 ◽  
Author(s):  
Yifei Zhang ◽  
Qihang Zhang ◽  
Carlos Ríos ◽  
Mikhail Y. Shalaginov ◽  
Jeffrey B. Chou ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Wafer Level ◽  
Optical Phase

scholarly journals Myths and truths about optical phase change materials: A perspective

2021 ◽  
Vol 118 (21) ◽  
pp. 210501
Author(s):  
Yifei Zhang ◽  
Carlos Ríos ◽  
Mikhail Y. Shalaginov ◽  
Mo Li ◽  
Arka Majumdar ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Optical Phase

Thermal Contact Resistance of Phase Change and Grease Type Polymeric Materials

2000 ◽  
Author(s):  
Ravi S. Prasher ◽  
Craig Simmons ◽  
Gary Solbrekken
Keyword(s):  
Thermal Conductivity ◽  
Contact Resistance ◽  
Phase Change ◽  
High Performance ◽  
Phase Change Materials ◽  
Thermal Contact ◽  
Polymeric Materials ◽  
Thermal Interface Material ◽  
Heat Spreader ◽  
Thermal Grease

Abstract Thermal interface material (TIM) between the die and the heat spreader or between the heat spreader and the heat sink in any electronic package plays a very important role in the thermal management of electronic cooling. Due to increased power and power density high-performance TIMs are sought every day. Phase change materials (PCM) seem to be very good alternative to traditionally used thermal greases because of various reasons. These phase change materials also have the advantage of being reworked easily without damaging the die. Typically these phase change materials are polymer based and are particle laden to enhance their thermal conductivity. The thermal conductivity of these materials is relatively well understood than their contact resistance. Current work focuses on explicitly measuring the contact resistance and the thermal conductivity of a particular phase change TIM and some silicon-based greases. Effect of various parameters, which can affect the contact resistance of theses TIMs and Greases, are also captured. The steady state measurements of the thermal conductivity and the contact resistance was done on an interface tester. In general the work on the contact resistance of fluid-like polymer based TIM, such as thermal grease or phase change polymer has been experimental in the past. A semi-analytical model, which captures the various parameters affecting the contact resistance of two class of materials; the phase change and the thermal grease is also developed in this paper. This model fits very well with the experimental data.

Magnetically tightened form-stable phase change materials with modular assembly and geometric conformality features

2021 ◽  
Author(s):  
Yongyu Lu ◽  
Dehai Yu ◽  
Haoxuan Dong ◽  
Jinran Lv ◽  
Lichen Wang ◽  
...  
Keyword(s):  
Phase Change ◽  
High Performance ◽  
Magnetic Particles ◽  
Phase Change Materials ◽  
Stable Phase ◽  
Free Standing ◽  
Modular Assembly ◽  
Significant Step ◽  
Dynamic Assembly ◽  
Surrounding Space

Abstract Recently, phase change materials (PCMs) have attracted significant attention due to their promising applications in many fields like solar energy and chip cooling. However, the present PCMs seriously suffer inevitable leakage and low thermal conduction. Magnetism can produce invisible field effects in the surrounding space. If there exist magnetic particles within this region, the effects will act on them emerging various fascinating phenomena. Inspired by this, we introduce hard magnetic particles (which can keep the effect after removing the magnetic field) to PCMs synthesizing an unprecedented magnetically tightened form-stable PCMs (MTPCMs), achieving multifunctions of leakage-proof, dynamic assembly and morphological reconfiguration, superior high thermal (increasing of 1400%~1600%) and electrical (>104 S/m) conductivity, and prominent compressive strength. Novel free-standing temperature control and high-performance thermal and electric conversion systems based on MTPCMs are furthermore developed. This work is a significant step toward exploiting a smart PCM for electronics and low-temperature energy storage.

High-performance composite phase change materials for energy conversion based on macroscopically three-dimensional structural materials

2019 ◽  
Vol 6 (2) ◽  
pp. 250-273 ◽  
Author(s):  
Jie Yang ◽  
Li-Sheng Tang ◽  
Lu Bai ◽  
Rui-Ying Bao ◽  
Zheng-Ying Liu ◽  
...  
Keyword(s):  
Phase Change ◽  
Energy Conversion ◽  
High Performance ◽  
Phase Change Materials ◽  
Three Dimensional ◽  
Structural Materials ◽  
Shape Stability ◽  
Efficient Energy ◽  
Composite Phase Change Materials ◽  
High Performance Composite

Macroscopically three-dimensional structural materials endow composite phase change materials with enhanced comprehensive performance, including excellent shape stability, high thermal conductivity and efficient energy conversion.

Broadband low-loss optical phase change materials and devices (Conference Presentation)

2018 ◽  
Author(s):  
Yifei Zhang ◽  
Jeffery Chou ◽  
Junying Li ◽  
Qingyang Du ◽  
Qihang Zhang ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Low Loss ◽  
Optical Phase
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