A pillar-array based two-dimensional photonic crystal microcavity

Abstract

Experimental results are presented for a high quality factor cavity based on pillar arrays. The cavity is formed from a square lattice of silicon pillars of finite height. The quality factor of the fundamental mode is about 7300 when the cavity is in air and 7800 when it is immersed in water. Since a pillar array has a large percent of connected void space and confines TM modes effectively, it has great promise for use in numerous areas including biochemical sensing and quantum cascade lasers.

Strong transmittance above the light line in mid-infrared two-dimensional photonic crystals

“…More recently, transmission measurements in the near-infrared range below the light line have been performed using silicon micropillars with aspect ratios between 1/1.8 and 1/3.0. 24,25 Similar to our microtube PhCs, these structures exhibit a design with a large void space in their structure, which makes them suitable for chemical and biological sensing. However, the aspect ratio of the silicon micropillars is significantly lower than that of our microtubes and, in contrast to the alumina pillars, the silicon micropillars rely on total internal reflection to achieve high transmittance below the light line.…”

“…However, the aspect ratio of the silicon micropillars is significantly lower than that of our microtubes and, in contrast to the alumina pillars, the silicon micropillars rely on total internal reflection to achieve high transmittance below the light line. 24,25 Several attempts have been made by other groups to fabricate high aspect ratio PhC structures with 2D optical properties. 13,26,27 However, most of these structures are hole-type PhCs proven to have 2D optical properties that are unaffected by their vertical extent.…”

Frequency comparison of light transmission in a defected quasi-one-dimensional photonic crystal slab

“…Since the pioneer proposals for inhibition of light emission [1] and localization of light [2], different approaches on PCs have been investigated. In recent experimental research, more attention has been given to photon localization in PC microcavities and wave guides [3][4][5], nanocavities [6], and disordered or amorphous PCs [7][8][9]. Theoretical investigations have mostly used perturbation theory completed with Green tensor [10,11], tight binding method [12][13][14], Wannier function [15], and Lippmann-Schwinger formalism [16].…”

Lasing in optimized two-dimensional iron-nail-shaped rod photonic crystals

“…In contrast, rod-type 2D PhC structures offer several advantages, such as strong mechanical stability, good thermal conductivity, and strong lateral carrier confinement without buried heterostructure. [4][5][6][7] Additionally, rod-type PhCs are a good candidate for optofluidic sensors because of their high sensitivity to environmental changes. [7][8][9][10] However, there is no PBG in the rod-type PhCs used for transverse electric (TE) polarization; therefore, it is difficult to form a high-quality (Q) factor cavity mode by introducing defect structures in PhCs.…”

“…[4][5][6][7] Additionally, rod-type PhCs are a good candidate for optofluidic sensors because of their high sensitivity to environmental changes. [7][8][9][10] However, there is no PBG in the rod-type PhCs used for transverse electric (TE) polarization; therefore, it is difficult to form a high-quality (Q) factor cavity mode by introducing defect structures in PhCs. 11 Lasing with TE polarization for rod-type PhCs was demonstrated using the Γ-point bandedge (BE) mode whose group velocity is small enough to obtain the threshold gain.…”