title: Far-field self-focusing and -defocusing radiation behaviors of the electroluminescent light sources due to negative refraction.
abstract: In recent years, researchers have demonstrated negative refraction theoretically and experimentally by pumping optical power into photonic crystal (PhC) or waveguide structures. The concept of negative refraction can be used to create a perfect lens that focuses an object smaller than the wavelength. By inserting two-dimensional PhCs into the peripheral of a semiconductor light emitting structure, this study presents an electroluminescent device with negative refraction in the visible wavelength range. This approach produces polarization dependent collimation behavior in far-field radiation patterns. The modal dispersion of negative refraction results in strong group velocity modulation, and self-focusing and -defocusing behaviors are apparent from light extraction. This study further verifies experimental results by using theoretic calculations based on equifrequency contours.
authors: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei City 10617, Taiwan.
authors: Yu-Feng
authors: YF
authors: Yin
authors: Yen-Chen
authors: YC
authors: Lin
authors: Tsung-Han
authors: TH
authors: Tsai
authors: Yi-Chun
authors: YC
authors: Shen
authors: Jianjang
authors: J
authors: Huang