Unveiling the Pockels Coefficient of Ferroelectric Nitride ScAlN
arxiv(2024)
摘要
Nitride ferroelectrics have recently emerged as promising alternatives to
oxide ferroelectrics due to their compatibility with mainstream semiconductor
processing. ScAlN, in particular, has exhibited remarkable piezoelectric
coupling strength (K^2) comparable to that of lithium niobate (LN), making it
a valuable choice for RF filters in wireless communications. Recently, ScAlN
has sparked interest in its use for nanophotonic devices, chiefly due to its
large bandgap facilitating operation in blue wavelengths coupled with promises
of enhanced nonlinear optical properties such as a large second-order
susceptibility (χ^(2)). It is still an open question whether ScAlN can
outperform oxide ferroelectrics concerning the Pockels effect – an
electro-optic coupling extensively utilized in optical communications devices.
In this paper, we present a comprehensive theoretical analysis and experimental
demonstration of ScAlN's Pockels effect. Our findings reveal that the
electro-optic coupling of ScAlN, despite being weak at low Sc concentration,
may be significantly enhanced at high levels of Sc doping, which points the
direction of continued research efforts to unlock the full potential of ScAlN.
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