Photon Statistical Properties of Single Terrylene Molecules in P-Terphenyl Crystals

We consider the photon emission statistical properties of a single molecule under pump-probe field driving, using the generating function method. The first- and second-order moments of statistical quantities are presented. Derived from the first-order moment, the line shapes are in good agreement with the experimental results. Derived from the second-order moment, Mandel＇s Q parameters show an obvious quantum effect of photon statistical distribution, i.e., the anti-bunching effect.

Polymeric photonic molecule super-mode lasers on silicon

Optically coupled microcavities have emerged as photonic structures with promising properties for investigation of fundamental science as well as for applications.We report on the fabrication and spatially resolved spectroscopy of on-chip photonic molecule(PM)lasers consisting of two coupled,dye-doped polymeric microdisks on a silicon substrate.We investigate the fundamental lasing properties with focus on the spatial distribution of modes,the coupling dependent suppression of lasing modes,and in particular the application-oriented operation of these devices in aqueous environments.By depositing an additional polymer layer onto the lithographically structured cavities made of dye-doped poly(methyl methacrylate),coupling-gap widths below 150 nm with aspect ratios of the micro-/nanostructure exceeding 9:1 are achieved.This enables strong optical coupling at visible wavelengths despite relatively small resonator radii of 25 μm.The lasing properties of dye-doped PMs are investigated using spatially resolved micro-photoluminescence(μ-PL)spectroscopy.This technique allows for the direct imaging of whispering-gallery modes(WGMs)in the photonics molecules.For subwavelength coupling gaps,we observe lasing from delocalized eigenstates of the PMs(termed in the following as super-modes).Using size-mismatched cavities,the lasing mode suppression for different coupling-gap widths is investigated.We further demonstrate single-mode lasing operation in aqueous environments with PMs,which are realized on a low-cost,polymer-on-silicon platform.

Photonic molecules with a tunable inter-cavity gap

Optical micro-resonators have broad applications.They are used,for example,to enhance light–matter interactions in optical sensors or as model systems for investigating fundamental physical mechanisms in cavity quantum electrodynamics.Coupling two or more micro-cavities is particularly interesting as it enlarges the design freedom and the field of application.In this context,achieving tunability of the coupling strength and hence the inter-cavity gap is of utmost importance for adjusting the properties of the coupled micro-resonator system.In this paper,we report on a novel coupling approach that allows highly precise tuning of the coupling gap of polymeric micro-resonators that are fabricated side by side on a common substrate.We structure goblet-shaped whispering-gallery-mode resonators on an elastic silicone-based polymer substrate by direct laser writing.The silicone substrate is mechanically stretched in order to exploit the lateral shrinkage to reduce the coupling gap.Incorporating a laser dye into the micro-resonators transforms the cavities into micro-lasers that can be pumped optically.We have investigated the lasing emission by micro-photoluminescence spectroscopy,focusing on the spatial localization of the modes.Our results demonstrate the formation of photonic molecules consisting of two or even three resonators,for which the coupling strengths and hence the lasing performance can be precisely tuned.Flexibility and tunability are key elements in future photonics,making our approach interesting for various photonic applications.For instance,as our coupling approach can also be extended to larger cavity arrays,it might serve as a platform for tunable coupled-resonator optical waveguide devices.

Emission and Energy Transfer Characteristics of Coumarin 6 Molecules Doped in Opal Polymer Photonic Crystal

The emission of coumarin 6（C-6） doped in opal polymethylmethacrylate（PMMA） photonic crystal（PC） was effectively manipulated. Meanwhile the energy transfer（ET） of C-6 in PCs, which are infiltrated with sulforho- damine B（S-B）, was influenced by the concentration of energy acceptor in solution, the size of PMMA micro- sphere（SM） and the photonic stop band（PSB）. The results should be beneficial to people to further understand the potential application of PCs in optoelectronic fields.