Abstract
Wavelength conversion is one of the most demanded features in integrated photonics. During the last decade, second harmonic generation (SHG) in III-V semiconductor microdisks has been demonstrated to be an efficient way to achieve such conversion with particularly compact devices. Optimized coupling of both wavelengths to these devices still remains as a challenge. Here we compare three different approaches for vertical coupling between integrated waveguides and a III-V microdisk resonator in which SHG occurs: two well-established schemes and a new one using a single slit waveguide as an evanescent coupler.
Highlights
Wavelength conversion is one of the most demanded features in integrated photonics
A usual configuration for such wavelength conversion is the use of second order nonlinear microdisk resonators
They offer highly confined whispering gallery modes (WGMs) [4] and the possibility of different phase matching schemes, from modal phase matching [5,6] to strict 4 ̄-phase-matching [7,8] allowing the possibility of achieving high efficiencies [9,10]
Summary
Wavelength conversion is one of the most demanded features in integrated photonics. During the last decade, second harmonic generation (SHG) in III-V semiconductor microdisks has been demonstrated to be an efficient way to achieve such conversion with compact devices. Using two distinct waveguides for the coupling of fundamental and SH modes (add-drop configuration) straightforwardly solves the zero β mismatch issue at the desired wavelengths.
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