Enhancement and reproducibility of high quality factor, one-dimensional photonic crystal/photonic wire (1D PhC/PhW) microcavities

Abstract

Background: The production of compact and multi-functional photonic devices has become a topic of major research activity in recent years. Devices have emerged that can be used for functional requirements in high speed optical data processing, filtering, nonlinear optical functions such as all-optical switching -and many other applications. The combination of photonic crystal (PhC) structures consisting of a single row of holes embedded in a narrow photonic wire (PhW) waveguide realised in high index-contrast materials is a possible contender for provision of a range of compact devices on a single chip. This trend has been motivated by the availability of a silicon technology that can support monolithic integration to form fully functional devices on CMOS chips. Results: We have successfully demonstrated experimentally an enhancement of the quality factor of a one-dimensional (1D) photonic crystal/photonic wire (PhC/PhW) microcavity that can exhibit resonance quality factor (Q-factor) values as high as 800,000 -together with a low modal volume of approximately 0.5 (λ/n) 3 . These results are based on the use of a mode matching approach previously used for device design -through the engineering of tapered hole sections within and outside the cavity -and were achieved without removing the silica cladding layer below the silicon waveguide core. The simulation results obtained in this case also agree with the experimental results obtained. Conclusions:In this work we have demonstrated that the mode matching, as light enters the photonic crystal structure, can be further enhanced through the use of careful fine tuning of the third hole, t 3 of the tapered hole region outside the cavity. The Q-factor value obtained was approximately four times greater than that achieved in our previous work on a similar structure.

An Efficient Photonic Crystal‐Based Chemical Sensor for the Detection of Isopropanol, Ethanol, and Acetone

“…As can be seen, there is a considerable enhancement in the quality factor with the increase of θ 0, especially for angles of incidence > 60°. [ 47 ] The quality factor can reach 14.84 × 10 3 , 13.26 × 10 3 , and 13.25 × 10 3 for isopropanol, ethanol and acetone, respectively at θ 0 = 80 ° . A high‐quality factor means a sharp resonant peak and as a result, this improves the wavelength resolution.…”

“…The results show that there is a considerable quality factor enhancement with the increase of N where the highest value is obtained at N = 8. [ 47 ] The quality factor equals 21.82 × 10 5 , 21.48 × 10 5 , and 21.46 × 10 5 for isopropanol, ethanol, and acetone, respectively, at N = 8. A high‐quality factor means that the DMEs have very sharp bandwidths.…”

Engineering the light coupling between metalens and photonic crystal resonators for robust on-chip microsystems

“…The light with mode profile matching propagates smoothly from the focused Gaussian beam into the periodic PhC structure. [22][23][24]…”

“…1(d) is the FWHM of the electric field intensity distribution in the PhC WG as a standard line for mode matching between metalens and PhC structure. The light with mode profile matching propagates smoothly from the focused Gaussian beam into the periodic PhC structure [22][23][24] .…”

Purcell and Collection Efficiency Enhancement of Single NV‐ Center Emission Coupled to an Asymmetric Tamm Structure

“…[4] LDOS can be engineered using several subwavelength photonic structures to enhance or suppress the emission from an embedded emitter. [5,6] Photonic structures such as photonic crystal cavities, [6][7][8] plasmonic cavities, [9] Mie resonances, [10] and resonant metasurfaces [11] show the cavity mode with a high-quality factor (Q-factor) and small mode volume to achieve control over the emission properties of an embedded emitter.…”