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Tunable Integrated Photonic Crystal Using HOT

:By

Noam Katz

M.Sc student under the joint supervision of

Prof. Jacob Scheuer and Dr. Yael Roichman

Abstract

In this work, our goal was to demonstrate the capability of realizing dynamic, optically controlled, photonic band gap devices, and to characterize their optical properties. We did so using a holographic optical tweezers (HOT) setup. Using the HOT's dynamic, real time abilities to control the 3D position of colloidal particles, we managed to assemble dielectric particles into periodic structures between prepositioned optical fibers. Using the suggested approach, we gained the ability to post-tune the optical characteristics of the structure and thus, control the optical device's properties. In order to characterize the spectral properties of the created structures, we measured the transmission through the colloidal assembly as a function of the transmitted incident beam’s wavelength. We managed to couple to the photonic crystal device by providing a fiber coupled device with simple interfacing with external systems. Our results show that the transmission spectrum is affected by the structural details of the colloidal crystal. Furthermore, we calculated numerically the expected transmission spectrum and the colloidal material’s photonic band diagram. We found good agreement between the simulation calculation and the experimental results. 

On Thursday, November 9, 2017, 10:00

Classroom 206, Wolfson building