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Dynamic Optical Gratings Accessed by Reversible Shape Memory.

Cary A Tippets¹, Qiaoxi Li², Yulan Fu³

¹†Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

ACS Applied Materials & Interfaces

|June 18, 2015

Summary

This summary is machine-generated.

This study introduces reversible shape memory polymers for tunable optical devices. These polymers enable repeatable intensity modulation of diffraction gratings, enhancing functionality.

Keywords:

elastomers photonic structures responsive surfaces reversible shape memory shape memory polymers

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Area of Science:

Materials Science
Polymer Science
Optics

Background:

Shape memory polymers (SMPs) can replicate photonic structures for tunable optical responses.
Conventional SMP processes are limited by irreversibility, hindering practical applications.
Developing reversible SMPs is crucial for advanced optical devices.

Purpose of the Study:

To demonstrate intensity modulation of a diffraction grating using reversible shape changes in SMPs.
To investigate the partial melting and recrystallization of poly(octylene adipate) for reversible grating height adjustments.
To assess the repeatability and extent of diffraction intensity modulation.

Main Methods:

Utilized semicrystalline poly(octylene adipate) for reversible shape memory effects.
Employed partial melting and recrystallization to achieve reversible shifting of grating height.
Monitored grating shape using atomic force microscopy (AFM).
Measured first-order diffraction intensity to quantify optical response.

Main Results:

Achieved reversible shifting of diffraction grating height through controlled melting and recrystallization.
Observed concurrent variations in grating shape and diffraction intensity.
Demonstrated a maximum diffraction intensity reversibility of 36% over multiple cycles.
Confirmed the repeatability of the reversible shape memory process.

Conclusions:

Reversible shape memory processes in SMPs can effectively modulate diffraction grating intensity.
Partial melting and recrystallization of poly(octylene adipate) enable tunable optical responses.
This approach broadens the functionality of SMP-based optical devices by overcoming limitations of conventional irreversible processes.