One-Dimensional Photonic Research Articles

一维掺杂光子晶体中偏振光缺陷模的光场分布

一维掺杂光子晶体中偏振光缺陷模的光场分布

一维掺杂光子晶体缺陷模的干涉理论

一维掺杂光子晶体缺陷模的干涉理论

Long-Range, Photon-Mediated Exciton Hybridization in an All-Organic, One-Dimensional Photonic Crystal

We demonstrate an all-organic, one-dimensional photonic crystal tuned to the regime of strong exciton-photon coupling. The structure consists of a high index of refraction light-absorbing active layer periodically distributed in a low index of refraction nonabsorbing background medium. The strongly coupled state in this structure is shared between multiple active layers separated by distances longer than the wavelength of light in the structure. In order to investigate the potential for long-range energy transfer, photon-mediated exciton hybridization is demonstrated between multiple absorbing species spatially separated in the photonic crystal.

Evanescent-Field Modulation of Amplified Spontaneous Emissions from -Conjugate Polymer Film by a One-Dimensional Photonic Crystal

One-dimensional photonic crystal (PC) with alternating layers ofTiO 2 and SiO 2 was fabricated with spin coating and low temperature baking, resulting in a successful tuning of the PC stop band so as to block the amplified spontaneous emission (ASE) of a π-conjugate polymer film. Single PC as a substrate, not a cavity with two PC's, of the polymer film was sufficient to shift the tangential ASE to the energy at PC stop band edge, indicating that the tangential ASE propagating along the interface was modulated by its evanescent-field tail in the PC, which opens the new pathway for low-threshold coherent luminescence from an ultrathin π-conjugate polymer film with ultimate mode volume.

Nonlinear Localization due to a Double Negative Defect Layer in a One-Dimensional Photonic Crystal Containing Single Negative Material Layers

We investigate the effects of introducing a defect layer in a one-dimensional photonic crystal containing single negative material layers on the transmission properties. The width of the defect layer is taken to be the same or smaller than the period of the structure. Different cases of the defect layer being linear or nonlinear and double positive or double negative are discussed. It is found that only a nonlinear double negative layer gives rises to a localized mode within the zero-φeff gap in this kind of structure. It is also shown that the important characteristics of the nonlinear defect mode such as its frequency, its FWHM and the threshold of the associated bistability can be controlled by changing the widths of the defect layer and the host layers.

Low Driving Voltage Tunable Laser Based on One-dimensional Photonic Crystal Containing Liquid Crystal Defect Layer

ABSTRACT Electrical tuning of a wavelength of a defect mode lasing in a one-dimensional periodic structure has been demonstrated using a dye-doped nematic liquid crystal as a defect layer in the periodic structure. Lasing wavelength is widely tuned upon applying the electric field, which is due to the refractive index change in the defect layer caused by the field-induced realignment of the liquid crystal molecules.

Laser Action Based on Electrically Controllable Defect Mode in One-Dimensional Photonic Crystal Containing Conducting Polymer and Liquid Crystal Defect Layers

ABSTRACT Electrical tuning of the wavelength of a defect mode lasing in a one-dimensional photonic crystal has been demonstrated using a conducting polymer as an active emission layer and a nematic liquid crystal as an electrically tunable defect layer in the periodic structure. Lasing wavelength is widely tuned upon applying the electric field, which follows a defect mode shift due to the refractive index change in the nematic liquid crystal defect layer caused by field-induced realignment of the liquid crystal molecules.

Tuning of the Photonic Band Gaps and the Reflection Spectra of a One-Dimensional Photonic Crystal Based on Silicon and a Liquid Crystal

The reflection spectra and the photonic band gaps of a one-dimensional composite photonic crystal are calculated for different filling factors (the ratio of the thickness of a silicon layer to the lattice constant A). A change in the refractive index of the filler in a photonic crystal leads to the shift of both edges for certain side photonic bands. It is shown that, with a change in the refractive index from 1.49 to 1.69, the shift of the edges (the tuning effect) can reach the value A/λ = 0.04 for the main photonic band and 0.08 for a side band. An additional criterion for designing a photonic crystal is the estimation of the sharpness of the edges of photonic bands in the reflection spectra.

Fast Electrooptic Response Based on Defect Mode Switching in One-Dimensional Photonic Crystal Containing Nematic Liquid Crystal and Ferroelectric Liquid Crystal as a Defect Layer

Electrical tuning of defect modes in a one-dimensional photonic crystal has been demonstrated using a ferroelectric liquid crystal and a nematic liquid crystal as a defect layer in the periodic structure. The theoretical calculation based on a simple transfer matrix has been carried out, and the result has been found to agree with the experimental result. A high-speed electrooptic switching based on the tunable defect mode has also been demonstrated. The response time of the order of several tens microseconds in this defect mode switching has been realized at low driving voltage.

Effects of Kerr nonlinearity on the band-gap structure of one-dimensional photon ic crystals

The effects of Kerr nonlinearity on the band-gap structure of one-dimensional ph otonic crystals was investigated. The photonic band-gap in the nonlinear region can be modulated by changing the intensity. It was found that due to the nonline ar modulation, the electromagnetic eigenmodes of cosine function type go into th e linear gap and become soliton-like modes of hyperbolic secant function type. A number of novel soliton-like electromagnetic modes are found in the gap.