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Linear electro-optic effect in trigonal LiNbO3: A first-principles study
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DOI：10.1103/PhysRevMaterials.8.025202.png)
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Lithium niobate LiNbO3 (LN) has emerged as a promising electro-optic (EO) material with applications in silicon photonics. It demonstrates a large linear EO response, often referred to as the Pockels effect. We report on a first-principles investigation of the origins of the Pockels response in R3c LN. We examine three contributions to the Pockels tensor, its electronic, ionic (Raman), and piezoelectric components, and demonstrate that the large value of Raman susceptibility can be traced to specific A1 modes that affect the Nb-O bonding. To examine the origin of the piezoelectric Pockels response, we compute the elasto-optic and piezoelectric tensors. Importantly, the largest component of the Pockels tensor r33 is dominated by the ionic response, which explains the insensitivity of the EO effect in LN to frequency.
Keyword:
LITHIUM-NIOBATE
ULTRASOFT PSEUDOPOTENTIALS
SILICON PHOTONICS
OPTICAL PHONONS
DYNAMICS
期刊
IF:
3.4
论文数:
5.2K
被引数:
1.7W
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