Abstract
Versatile novel implementations in microspectroscopy are developed, which can provide angle-resolved optical spectroscopy at local sample areas almost in diffraction limit. By selecting focus position of light flux incident within the back focal plane of the objective lens radially from the position of the optical axis of the microscope with employing off-centered pinhole, we can obtain parallel beam with oblique incidence and its angle tuning at the sample surface. In this paper, we describe our specific optical setup and its practical working principle in detail. We report, as a demonstration of its performance, our latest studies on optical properties of cavity polariton states in the so-called quantum microcavity structures, which contain molecular J-aggregates of pseudoisocyanine (PIC) dye as active working materials. By using the microscope technique, we obtain a fair amount of improvement in the linewidth observation of cavity polariton spectra.
Highlights
With spectacular development of recent microfabrication technologies, it is increasingly important to monitor optical properties of matters at its more minute levels
One of the most significant and informative spectroscopic techniques is the observation of the angle-resolved optical features
The microcavities containing J-aggregates are known as the useful structures to form strong-coupling states between light and matters, the so-called cavity polariton states, even at room temperatures [1, 2]
Summary
With spectacular development of recent microfabrication technologies, it is increasingly important to monitor optical properties of matters at its more minute levels. We have developed novel optical microscopy system which can provide observations on the angular-dependent optical features at local sample regions almost to its diffraction-limited spatial resolution This system should possess broader utilities and work in a wide variety of situations, for example, fundamental studies such as local optical spectra of materials with fabricated structures, evaluations of microfabricated photonic as well as electronic functional devices. The microcavities containing J-aggregates are known as the useful structures to form strong-coupling states between light and matters, the so-called cavity polariton states, even at room temperatures [1, 2] These hybrid quantum states have attracted much attention due to their fundamental physical significance [1,2,3,4] and possible applications for low-threshold laser [5], entangled photon-pair generator [6, 7], and related future optoelectronic devices as well. By the custom-made microspectroscopy system, we can expect first to approach some of the origins of inhomogeneities in the linewidth of cavity polariton states quantitatively, part of which will be demonstrated here
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