6 papers
Strain effects on Phase-Filling Singularities in Highly Doped n-Type Ge
Zhigang Song, Wei-Jun Fan, C. S. Tan +4
Recently, Chi Xu et al. predicted the phase-filling singularities (PFS) in the optical dielectric function (ODF) of the highly doped -type Ge and confirmed in experiment the PFS…
Spatial structure of lasing modes in wave-chaotic semiconductor microcavities
Stefan Bittner, Kyungduk Kim, Yongquan Zeng +2
We present experimental and numerical studies of broad-area semiconductor lasers with chaotic ray dynamics. The emission intensity distributions at the cavity boundaries are measur…
Band structure of strained GeSn alloy: a full-zone 30-band model
Zhigang Song, Weijun Fan, Chuan Seng Tan +4
We extend the previous 30-band model effectively employed for relaxed GeSn alloy to the case of strained GeSn alloy. The strain-relevant p…
Electrically pumped semiconductor laser with low spatial coherence and directional emission
Kyungduk Kim, Stefan Bittner, Yongquan Zeng +3
We design and fabricate an on-chip laser source that produces a directional beam with low spatial coherence. The lasing modes are based on the axial orbit in a stable cavity and ha…
Band structure of GeSnalloy: a full-zone 30-band model
Zhigang Song, Weijun Fan, Chuanseng Tan +4
A full-zone 30-band model is developed as an efficient and reliable tool to compute electronic band structure in GeSn alloy. The model was first used to…
All-dielectric active photonics driven by bound states in the continuum
Song Han, Longqing Cong, Yogesh Kumar Srivastava +6
Recently emerged dielectric resonators and metasurfaces offer a low-loss platform for efficient manipulation of electromagnetic waves from microwave to visible. Such flat meta-opti…