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Near‐ and far‐field verification of electro‐optic effect enhancement on a tunable lithium niobate photonic crystal
Author(s) -
BERNAL M.P.,
ROUSSEY M.,
BAIDA F. I.
Publication year - 2008
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2008.01897.x
Subject(s) - lithium niobate , photonic crystal , materials science , electro optic effect , optoelectronics , photonics , optics , excitation , band gap , crystal (programming language) , nanostructure , voltage , electric field , physics , nanotechnology , computer science , programming language , quantum mechanics
Summary In this paper, we present the optical response of a tunable lithium niobate photonic crystal (PC) using the electro‐optic effect of the material. The band gap tunability is 300 times higher than what one could expect for a bulk lithium niobate device of the same characteristics. Theoretical calculations based on the finite‐difference time domain technique have allowed us to determine the physical origin of this enhanced electro‐optic coefficient. Indeed, the effective second‐order susceptibility in the LN nanostructure increases, giving rise to an ultra‐compact low‐voltage photonic crystal modulator when it operates at its band edge. In addition, the theoretical and far‐field transmission results are confirmed by near‐field optical microscopy images of the structure at different excitation voltages.