Ultrasensitive and compact tunable electro-optic filter in a 2D silicon photonic-crystal cavity

Abstract

In this work, we designed and simulated a high Q-factor photonic crystal cavity with a PN junction to demonstrate a high-sensitivity and high tunable electro-optic filter (EOF). For this purpose, we used a cavity based on 2D photonic crystal structures and created a PN junction with 1 μm width in the center of the cavity to change the refractive index of it. The electro-optic sensitivity of the cavity was improved by reducing modal volume and scattering power. Reverse bias in the range of (−3.88 V-0.288 V) is applied to the PN junction and the output spectrum is investigated for various bias voltages. The output wavelengths of designed EOF can be tuned by manipulating cavity cells. In final response of EOF the maximum transmission efficiency is more than 93%, the overall Q-factor is more than 14 500. The whole device fits in a compact 102.6 μm 2 (17.4 μm × 5.9 μm) footprint.

Si-atoms substitutions effects on the electronic and optical properties of coronene and ovalene

“…HOMO-LUMO gap Δ HL for coronene and ovalene substituted molecules (with single, dimer and trimer substitution) with indicated also the value of the percentage deviation Δ. 3 The representation by figure 4 takes into account the coronene EA V =0.39 as obtained with the * -+ G 6 31…”

“…These materials are, in fact, considered among the most promising candidates for dozens of different technological optoelectronic devices. In the contest of optoelectronic, silicon is one of the most useful elements to mankind, covering a considerable position for several reasons, especially for those linked to its electronic and optical properties that can be easily modulated and controlled [3]. Moreover, optoelectronic, that is a branch based on the study and the operation of electronic devices that produce, detect, and control light, actually is an esteemed and rapidly growing field [4]: recently, 2D materials, carbon nanotubes, and semiconductor quantum dots are elements of great attention thanks to their potential use in nano and optoelectronic devices.…”

Electrically pumped photonic crystal laser constructed with organic semiconductors

“…Due to the high density of states at band edges and the nonlinear property of the materials, PhC control devices like optical switches and wavelength converters have opened up the prospect of application in all-optical networks and optical logic calculation. In addition, ultralow-threshold ultrasmall PhC lasers with highquality (Q-factor) microcavities have become another promising research avenue since Painter first introduced a photonic bandgap defect-mode laser in 1999 [2][3][4][5][6]. Photonic crystals, compared with other microstructures utilized in lasers are an ideal candidate for flexibility in tuning of the symmetry, frequency and localization property of defects, thus demonstrating excellent ability for the manipulation of light and the modulation of spontaneous emission [7][8][9].…”