Ultra-thin, reconfigurable meta-optics using optical phase change materials (Conference Presentation)

2018 ◽  
Author(s):  
Mikhail Y. Shalaginov ◽  
Yifei Zhang ◽  
Sensong An ◽  
Jeffrey Chou ◽  
Qingyang Du ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Optical Phase

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

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

Electrically Reconfigurable Nonvolatile Metasurface Using Optical Phase Change Materials

2019 ◽  
Author(s):  
Yifei Zhang ◽  
Junhao Liang ◽  
Mikhail Shalaginov ◽  
Skylar Deckoff-Jones ◽  
Carlos Ríos ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Optical Phase

Reconfigurable All Dielectric Metasurfaces based on Optical Phase Change Materials: Design Approaches

2020 ◽  
Vol 35 (11) ◽  
pp. 1445-1446
Author(s):  
Mikhail Shalaginov ◽  
Sensong An ◽  
Yifei Zhang ◽  
Fan Yang ◽  
Clayton Fowler ◽  
...  
Keyword(s):  
Phase Change ◽  
Light Propagation ◽  
Phase Change Materials ◽  
High Efficiency ◽  
Focal Length ◽  
Large Change ◽  
Optical Phase ◽  
Main Challenge ◽  
Arbitrary Phase ◽  
Large Tuning Range

Optical metasurface is a recently emerged paradigm for controlling light propagation, which enables implementation of ultra-compact optical devices with extended functionalities. Nowadays the main challenge in the field is to realize active metasurfaces with high quality, high efficiency, and large tuning range. Here we present a design approach for constructing a two-state reconfigurable metalens made of low-loss optical phase-change material (O-PCM). The metalens design is capable to produce diffraction limited focusing, large change in focal length (from 1.5 mm to 2mm), and decent focusing efficiency of about 20% in both states. The proposed design methodology is generic and can be easily extended towards constructing metasurfaces, which can switch between two or more arbitrary phase maps.

Reconfigurable photonics enabled by optical phase change materials (Conference Presentation)

2018 ◽  
Author(s):  
Yifei Zhang ◽  
Jeffrey B. Chou ◽  
Qihang Zhang ◽  
Junying Li ◽  
Huashan Li ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Optical Phase

Reversible Switching of Optical Phase Change Materials Using Graphene Microheaters

2019 ◽  
Author(s):  
Carlos Ríos ◽  
Yifei Zhang ◽  
Skylar Deckoff-Jones ◽  
Hongtao Li ◽  
Jeffrey B. Chou ◽  
...  
Keyword(s):  
Phase Change ◽  
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.

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