Record Purcell factors in ultracompact hybrid plasmonic ring resonators

Abstract

For integrated optical devices and traveling-wave resonators, realistic use of the superior wave-matter interaction offered by plasmonics is impeded by ohmic loss, which increases rapidly with mode volume reduction. In this work, we report composite hybrid plasmonic waveguides (CHPWs) that are not only capable of guiding subwavelength optical mode with long-range propagation but also unrestricted by stringent requirements in structural, material, or modal symmetry. In these asymmetric CHPWs, the versatility afforded by coupling dissimilar plasmonic modes provides improved fabrication tolerance and more degrees of device design optimization. Experimental realization of CHPWs demonstrates propagation loss and mode area of 0.03 dB/μm and 0.002 μm2, corresponding to the smallest combination among long-range plasmonic structures reported to date. CHPW ring resonators with 2.5-μm radius were realized with record Purcell factor compared with existing plasmonic and dielectric resonators of similar radii.

On-chip nanophotonics and future challenges

“…The enhancement is defined as a ratio of the spontaneous emission rate in the system under consideration to that in the free space [144]. With the development of nanotechnology, nanophotonics opens up new avenues for engineering spontaneous emission of quantum emitters in specific surrounding media [145][146][147][148][149][150] including non-Hermitian media. Investigation of the spontaneous emission of the dipole emitter inside a PT -symmetric planar cavity has been recently performed by Akbarzadeh et al in Ref.…”

Ultra-compact titanium dioxide micro-ring resonators with sub-10-μm radius for on-chip photonics

“…where n 0 is the RI of the waveguide, and the effective mode volume V eff of the MRR can be simply calculated by V eff 2πRA eff [36]. Here, A eff is the effective mode area of a bend waveguide.…”

Supermode Hybridization: A Material-Independent Route toward Record Schottky Detection Sensitivity Using <0.05 μm3 Amorphous Absorber Volume

“…With a single active junction formed with amorphous materials, the design is backend compatible and can couple to Si nanowires with only 1.5 dB loss, thereby demonstrating the possibility of plasmonic-photonic integration on top of Si chips without costly process modifications. Furthermore, the detector can potentially enable FPGA-like, reconfigurable optical circuits, as the same waveguide architecture can be utilized for filtering and modulation by changing the bias configuration (26,27). Nonetheless, the physical mechanism that the photodetector utilized to overcome the absorber dilemma has yet been reported.…”