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.

scholarly journals Near-Infrared Rewritable, Non-Volatile Subwavelength Absorber Based on Chalcogenide Phase Change Materials

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1222 ◽  
Author(s):  
Jianfa Zhang ◽  
Yiqiong Zhang ◽  
Qilin Hong ◽  
Wei Xu ◽  
Zhihong Zhu ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Near Infrared ◽  
Beam Steering ◽  
Contrast Ratio ◽  
Photonic Devices ◽  
Optical Modulation ◽  
High Contrast ◽  
Perfect Absorption ◽  
Continuous Tuning

Chalcogenide phase change materials enable the realization of novel, non-volatile, switchable electronic and photonic devices. In this paper, we propose a type of rewritable, non-volatile near infrared subwavelength absorber based on chalcogenide phase change materials. Our numerical simulations show that nearly perfect absorption more than 0.99 can be realized in the written state while the absorption of as-deposited or erased state is lower than 0.15 in the studied spectral range, leading to high contrast ratio of reflection more than 20 dB. Continuous tuning of the absorption spectra can be realized not only by varying the geometric parameters of the absorber but also by changing the crystallization ratio of the switched Ge 2 Sb 2 Te 5 (GST). The proposed device may find widespread applications in optical modulation, beam steering and so on.

scholarly journals Optical phase change materials in integrated silicon photonic devices: review

2018 ◽  
Vol 8 (8) ◽  
pp. 2415 ◽  
Author(s):  
Kevin J. Miller ◽  
Richard F. Haglund ◽  
Sharon M. Weiss
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Photonic Devices ◽  
Optical Phase ◽  
Silicon Photonic

scholarly journals Phase Change Metasurfaces by Continuous or Quasi-Continuous Atoms for Active Optoelectronic Integration

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1272
Author(s):  
Zhihua Fan ◽  
Qinling Deng ◽  
Xiaoyu Ma ◽  
Shaolin Zhou
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Complementary Metal Oxide Semiconductor ◽  
Photonic Devices ◽  
Oxide Semiconductor ◽  
Cmos Process ◽  
Nanophotonic Devices ◽  
Optoelectronic Integration ◽  
Hybrid Devices ◽  
Micro Electromechanical System

In recent decades, metasurfaces have emerged as an exotic and appealing group of nanophotonic devices for versatile wave regulation with deep subwavelength thickness facilitating compact integration. However, the ability to dynamically control the wave–matter interaction with external stimulus is highly desirable especially in such scenarios as integrated photonics and optoelectronics, since their performance in amplitude and phase control settle down once manufactured. Currently, available routes to construct active photonic devices include micro-electromechanical system (MEMS), semiconductors, liquid crystal, and phase change materials (PCMs)-integrated hybrid devices, etc. For the sake of compact integration and good compatibility with the mainstream complementary metal oxide semiconductor (CMOS) process for nanofabrication and device integration, the PCMs-based scheme stands out as a viable and promising candidate. Therefore, this review focuses on recent progresses on phase change metasurfaces with dynamic wave control (amplitude and phase or wavefront), and especially outlines those with continuous or quasi-continuous atoms in favor of optoelectronic integration.

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

scholarly journals Photonic Devices: Plasmonic Metasurfaces for Switchable Photonic Spin-Orbit Interactions Based on Phase Change Materials (Adv. Sci. 10/2018)

2018 ◽  
Vol 5 (10) ◽  
pp. 1870063
Author(s):  
Ming Zhang ◽  
Mingbo Pu ◽  
Fei Zhang ◽  
Yinghui Guo ◽  
Qiong He ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Photonic Devices ◽  
Spin Orbit ◽  
Spin Orbit Interactions

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.

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