Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator

Waves in Random and Complex Media

Han

et al. 2020

Self Cite

Plasmonic resonators have drawn more attention due to the ability to confine light into subwavelength scale. However, they always suffer from a low quality (Q) factor owing to the intrinsic loss of metal. Here, we numerically propose a plasmonic resonator with ultra-high Q factor based on plasmonic metalinsulator-metal (MIM) waveguide structures. The resonator consists of a disk cavity surrounded by a concentric ring cavity, possessing an ultra-small volume. Arising from the plasmon hybridization between plasmon modes in the disk and ring cavity, the induced bonding hybridized modes have ultra-narrow full wave at half maximum (FWHM) as well as ultra-high Q factors. The FWHM can be nearly 1 nm and Q factor can be more than 400. Furthermore, such device can act as a refractive index sensor with ultra-high figure of merit (FOM). This work provides a novel approach to design plasmonic high-Q-factor resonators, and has potential on-chip applications such as filters, sensors and nanolasers.

Section: Resultsmentioning

confidence: 92%

Hybridization-induced resonances with high-quality factor in a plasmonic chipscale ring-disk nanocavity

Waves in Random and Complex Media

Han

et al. 2020

Self Cite

“…This structure has a high sensitivity up to 1303 nm/RIU, as indicated in Figure 4b, which can meet the requirement of chemical-sensing [31]. Besides, the sensitivity can be easily enhanced by increasing the side length of the SRR [14]. Since the FWHM is 67 nm, the FOM is approximately 20/RIU.…”

Section: Applications In Sensing and Switchingmentioning

confidence: 93%

“…Since the ring resonator is sensitive to ambient RI, such a channel drop filter can be applied to on-chip sensing. The sensing performance can be assessed by two factors [14]:…”

Section: Applications In Sensing and Switchingmentioning

confidence: 99%

See 1 more Smart Citation

Plasmonic Filter and Demultiplexer Based on Square Ring Resonator

et al. 2018

Applied Sciences

Self Cite

Abstract:A ring resonator is a basic component of traditional photonic integrated circuits (PIC), which has been, however, found difficult to be applied efficiently in high-compact plasmonic metal-insulator-metal (MIM) systems. Here, based on a plasmonic band-stop filter with a square ring resonator (SRR), a novel side-coupling method is introduced both numerically and theoretically to achieve a drop in the resonant wavelength in the SRR with considerable efficiency. By introducing the reflector structure, the performance can be appreciably improved. Besides, this structure also has potential for sensing and switching. Finally, a dual demultiplexer based on SRRs is realized at telecommunication wavelengths with comparable performance, which makes it possible to apply ring resonators in on-chip plasmonic wavelength division multiplex (WDM) networks. This work is valuable for PIC design, and will promote the on-chip plasmonic system progress.

“…(b) The delay time at different wavelengths.Furthermore, the four modes almost cover the whole visible light band, therefore providing multiband sensing ability over a broadband range. The sensing performance is assessed by two factors, sensitivity (S) and figure of merit (FOM)[23]:…”

mentioning

confidence: 99%

A plasmonic ellipse resonator possessing hybrid modes for ultracompact chipscale application

et al. 2019

Phys. Scr.

Self Cite

We propose a plasmonic ellipse resonator possessing hybrid modes based on metalinsulator-metal (MIM) waveguide system. Specially, this nanocavity has hybrid characteristic of rectangle and disk resonator, therefore supporting both Fabry-Perot modes (FPMs) and whisperinggallery modes (WGMs). Besides, by changing the length of major and minor radius of the ellipse, the resonant wavelengths of FPMs and WGMs can be independently tuned and close to each other, thus constructing a plasmon-induced transparency (PIT) -like spectrum profile. Benefitting from this, a dual-band slow light is achieved with one single resonator. Furthermore, this component can also act as a multi-band color filter and refractive index sensor. We believe such multi-mode resonator with ultra-small footprint will play an important role in more compact on-chip optical circuits in the future.