Temperature-responded tunable metalenses based on phase transition materials

2021 ◽  
Author(s):  
Jingjun Wu ◽  
Feng Tang ◽  
Jun Ma ◽  
Bing Han ◽  
Cong Wei ◽  
...  
Keyword(s):  
Phase Transition ◽  
Cost Saving ◽  
Ambient Temperature ◽  
Incident Light ◽  
Transmitted Light ◽  
Light Dose ◽  
Bio Imaging

Abstract Once the metalenses are fabricated, the functions of most are invariable. The tunability and reconfigurability are useful and cost-saving for metalenses in realistic applications. We demonstrated this tunability here via a novel hybrid metalens with the strategic placement of an ultra-thin VO2 layer. The hybrid metalens is capable of dynamically modulating the focusing intensity of transmitted light at 1550 nm, and demonstrated a 42.28% focusing efficiency of the incident light and 70.01% modulation efficiency. The hybrid metalens’ optothermal simulations show the optothermal conversion progress of dynamic focusing, and the maximum laser density of 1.76×103 W/cm2 can be handled at an ambient temperature lower than 330 K. The hybrid metalens proposed in this work, a light-dose sensitive tunable smart metalens that can protect other instruments/systems or materials from damage, has its specific applications such as anti-satellite blinding, bio-imaging, etc.

An irreversible phase transition in 1-n-butylindeno[2,1-c]pyran-3,9-dione

2012 ◽  
Vol 68 (10) ◽  
pp. o413-o416 ◽  
Author(s):  
Andrei S. Batsanov ◽  
Judith A. K. Howard ◽  
Na Wu ◽  
Zhen Yang ◽  
Todd B. Marder
Keyword(s):  
Phase Transition ◽  
Ambient Temperature ◽  
Single Crystal ◽  
Title Compound ◽  
Room Temperature ◽  
Side Chain ◽  
Compound C ◽  
Planar Conformation ◽  
Triclinic Phase ◽  
Out Of Plane

At ambient temperature, the title compound, C16H14O3, is triclinic, with then-butyl side chain disordered in an out-of-plane orientation. On cooling below 240 K, it converts into a different triclinic phase with an ordered planar conformation and denser packing, which is retained on warming to room temperature. The transition (occasionally) proceeds from single crystal to single crystal.

scholarly journals Ambient-temperature high-pressure-induced ferroelectric phase transition in CaMnTi2O6

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
J. Ruiz-Fuertes ◽  
T. Bernert ◽  
D. Zimmer ◽  
N. Schrodt ◽  
M. Koch-Müller ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Ambient Temperature ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase

Raman Scattering Spectroscopic Study of n-Pentane under High Pressure

2005 ◽  
Vol 59 (5) ◽  
pp. 650-653 ◽  
Author(s):  
Erwei Qiao ◽  
Haifei Zheng
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Ambient Temperature ◽  
Pressure Range ◽  
High Pressure Phase Transition ◽  
Stretching Vibration ◽  
Twist Mode ◽  
Solid Liquid ◽  
Pressure Phase

The Raman spectroscopy of n-pentane was investigated in a Moissanite anvil cell from 0.07 GPa to 4.77 GPa at ambient temperature. The result shows that the CH3 symmetric stretching vibration (2877 cm−1) and asymmetric stretching vibration (2964 cm−1), the CH2 symmetric stretching vibration (2856 cm−1) and asymmetric stretching vibration (2935 cm−1), and –(CH2)n– in-phase twist mode (1303 cm−1) shifted to higher wavenumbers almost linearly with increasing pressure. Around 2.4 GPa an abrupt visible change took place, indicating a sort of phenomenon of freezing due to over-pressurization. In the pressure range of 2.84 to 4.77 GPa a high-pressure phase transition may occur in the crystallized n-pentane. By determining pressure with the method of solid–liquid coexistence, we concluded that the equilibrium freezing pressure of n-pentane is 1.90 ± 0.05 GPa at 27 °C.

scholarly journals Multifunctional Metasurface Lens With Tunable Focus Based on Phase Transition Material

2021 ◽  
Vol 9 ◽  
Author(s):  
Yongkang Song ◽  
Weici Liu ◽  
Xiaolei Wang ◽  
Faqiang Wang ◽  
Zhongchao Wei ◽  
...  
Keyword(s):  
Phase Transition ◽  
Light Field ◽  
Focal Point ◽  
Incident Light ◽  
Polarization State ◽  
Polarized Light ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Multiple Focus ◽  
Linearly Polarized

Metasurfaces have powerful light field manipulation capabilities, which have been extensively studied in the past few years and have developed rapidly in various fields. At present, the focus of metasurface research has shifted to the tunable functionality. In this paper, a temperature-controllable multifunctional metasurface lens based on phase transition material is designed. First of all, by controlling the temperature of the desired working area and the polarization of the incident light, switching among multiple focus, single focus, and no focus at any position can be achieved, and the intensity and helicity of the output light can be adjusted. In addition, a polarization-sensitive intensity-tunable metalens based on the P-B phase principle is designed, when the incident light is linearly polarized light, left-handed circularly polarized light, or right-handed circularly polarized light, it has the same focal point but with different light field intensities. Therefore, the focused intensity can be tunable by the polarization state of the incident light.

scholarly journals Rapidly Reversible Organic Crystalline Switch for Conversion of Heat into Mechanical Energy

2021 ◽  
Author(s):  
Madushani Dharmarwardana ◽  
Srimanta Pakhira ◽  
Raymond P. Welch ◽  
Carlos Caicedo Narvaez ◽  
Michael A. Luzuriaga ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Ambient Temperature ◽  
Temperature Change ◽  
Temperature Regime ◽  
Room Temperature ◽  
Mechanical Energy ◽  
Reversible Systems ◽  
Physical Force ◽  
Original Length

<div> <div> <div> <p>Solid state thermosalience—a sudden exertion of an expansive or contractive physical force following a temperature change in a solid state compound—is rare, few are reversible systems, and most of these are limited to a dozen or so cycles before the crystal degrades or they reverse slowly over the course of many minutes or even hours. In this work, we show a fully reversible actuator that is stable at room temperature for multiple years and is capable of actuation for more than two hundred cycles at near ambient temperature. Specifically, the crystals shrink to 90% of its original length instantaneously upon heating beyond 45 °C and expands back to its original length upon cooling below 35 °C. This temperature regime is important because it occurs around physiologically important temperatures. Furthermore, the phase transition occurs instantaneously, with little obvious hysteresis, allowing us to create real-time actuating thermal fuses that cycle between on and off rapidly. </p> </div> </div> </div>

scholarly journals Rapidly Reversible Organic Crystalline Switch for Conversion of Heat into Mechanical Energy

2020 ◽  
Author(s):  
Madushani Dharmarwardana ◽  
Srimanta Pakhira ◽  
Raymond P. Welch ◽  
Carlos Caicedo Narvaez ◽  
Michael A. Luzuriaga ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Ambient Temperature ◽  
Temperature Change ◽  
Temperature Regime ◽  
Room Temperature ◽  
Mechanical Energy ◽  
Reversible Systems ◽  
Physical Force ◽  
Original Length

<div> <div> <div> <p>Solid state thermosalience—a sudden exertion of an expansive or contractive physical force following a temperature change in a solid state compound—is rare, few are reversible systems, and most of these are limited to a dozen or so cycles before the crystal degrades or they reverse slowly over the course of many minutes or even hours. In this work, we show a fully reversible actuator that is stable at room temperature for multiple years and is capable of actuation for more than two hundred cycles at near ambient temperature. Specifically, the crystals shrink to 90% of its original length instantaneously upon heating beyond 45 °C and expands back to its original length upon cooling below 35 °C. This temperature regime is important because it occurs around physiologically important temperatures. Furthermore, the phase transition occurs instantaneously, with little obvious hysteresis, allowing us to create real-time actuating thermal fuses that cycle between on and off rapidly. </p> </div> </div> </div>

scholarly journals Rapidly Reversible Organic Crystalline Switch for Conversion of Heat into Mechanical Energy

2020 ◽  
Author(s):  
Madushani Dharmarwardana ◽  
Srimanta Pakhira ◽  
Raymond P. Welch ◽  
Carlos Caicedo Narvaez ◽  
Michael A. Luzuriaga ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Ambient Temperature ◽  
Temperature Change ◽  
Temperature Regime ◽  
Room Temperature ◽  
Mechanical Energy ◽  
Reversible Systems ◽  
Physical Force ◽  
Original Length

<div> <div> <div> <p>Solid state thermosalience—a sudden exertion of an expansive or contractive physical force following a temperature change in a solid state compound—is rare, few are reversible systems, and most of these are limited to a dozen or so cycles before the crystal degrades or they reverse slowly over the course of many minutes or even hours. In this work, we show a fully reversible actuator that is stable at room temperature for multiple years and is capable of actuation for more than two hundred cycles at near ambient temperature. Specifically, the crystals shrink to 90% of its original length instantaneously upon heating beyond 45 °C and expands back to its original length upon cooling below 35 °C. This temperature regime is important because it occurs around physiologically important temperatures. Furthermore, the phase transition occurs instantaneously, with little obvious hysteresis, allowing us to create real-time actuating thermal fuses that cycle between on and off rapidly. </p> </div> </div> </div>

Rapidly Reversible Organic Crystalline Switch for Conversion of Heat into Mechanical Energy

2020 ◽  
Author(s):  
Madushani Dharmarwardana ◽  
Srimanta Pakhira ◽  
Raymond P. Welch ◽  
Carlos Caicedo Narvaez ◽  
Michael A. Luzuriaga ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Ambient Temperature ◽  
Temperature Change ◽  
Temperature Regime ◽  
Room Temperature ◽  
Mechanical Energy ◽  
Reversible Systems ◽  
Physical Force ◽  
Original Length

<div> <div> <div> <p>Solid state thermosalience—a sudden exertion of an expansive or contractive physical force following a temperature change in a solid state compound—is rare, few are reversible systems, and most of these are limited to a dozen or so cycles before the crystal degrades or they reverse slowly over the course of many minutes or even hours. In this work, we show a fully reversible actuator that is stable at room temperature for multiple years and is capable of actuation for more than two hundred cycles at near ambient temperature. Specifically, the crystals shrink to 90% of its original length instantaneously upon heating beyond 45 °C and expands back to its original length upon cooling below 35 °C. This temperature regime is important because it occurs around physiologically important temperatures. Furthermore, the phase transition occurs instantaneously, with little obvious hysteresis, allowing us to create real-time actuating thermal fuses that cycle between on and off rapidly. </p> </div> </div> </div>

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