Vertical-cavity in-plane heterostructures: Physics and applications

Abstract

We show that the in-plane heterostructures realized in vertical cavities with high contrast grating (HCG) reflector enables exotic configurations of heterostructure and photonic wells. In photonic crystal heterostructures forming a photonic well, the property of a confined mode is determined by the well width and barrier height. We show that in vertical-cavity in-plane heterostructures, anisotropic dispersion curvatures plays a key role as well, leading to exotic effects such as a photonic well with conduction band like well and a valence band like barrier. We investigate three examples to discuss the rich potential of this heterostructure as a platform for various physics studies and propose a system of two laterally coupled cavities which shows the breaking of parity-time symmetry as an example.

Numerical Investigation of Vertical Cavity Lasers With High-Contrast Gratings Using the Fourier Modal Method

“…Finally, the influence of adiabatic and abrupt in-plane heterostructures on the HCGbased cavity performance in transverse directions is investigated numerically. The reliability and numerical efficiency of the simulator presented in this work has been proven in our recent studies of HCG and related structures [8], [20], [29]- [31].…”

“…Moreover, it results in novel properties such as MEMS-based efficient wavelength tunability [14], [15], strong single-transverse-mode operation [13], [16], and engineering of output beam profiles [17], [18]. Furthermore, it has been recently shown that in-plane heterostructure implemented in HCG-based vertical cavities [19] enables exotic heterostructure configurations [20], which are attractive for fundamental physics studies [21].…”

All-Si photodetector for telecommunication wavelength based on subwavelength grating structure and critical coupling

“…The cap layer and grating layer form a hybrid grating (HG) resonator, which allows for almost complete absorption as shown below. The HG is a variant of the high-contrast grating (HCG) [16][17][18] and has an un-patterned cap layer on top of a nearsubwavelength grating layer. [19][20][21] It has been shown that HGs can provide extraordinary properties including high quality-factors (Q>10 7 ) 19 and high reflectivity (>99%) over a broad bandwidth.…”

Hybrid III–V/SOI resonant cavity enhanced photodetector

“…It can provide a reflectivity close to 100 % over a broad wavelength range [1], as well as control over reflection phase [2][3][4][5]. Based on these properties, many interesting verticalcavity laser (VCL) structures with novel functionalities have been realized [6][7][8][9][10][11][12][13][14][15][16][17][18]. Among them, the hybrid VCL approach appears promising for long wavelength applications, which combines a III-V material including a gain material with an HCG reflector formed in the silicon (Si) layer of a Si-on-insulator (SOI) wafer [11][12][13][14].…”