Fabry–Pérot modes and optical waveguide effects in individual thiophene/phenylene co-oligomer nanoneedle crystals

Bando, Kiyoshi; Takano, Toru; Fujii, Honami; Nakano, Tamiko; Makino, Daisuke; Kumeta, Shohei; Sasaki, Fumio; Hotta, Shu

doi:10.1063/1.4813554

Cited by 14 publications

(20 citation statements)

References 25 publications

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“…The diameters of the ring structures are on the order of several micrometers, and their number density on the KCl surfaces is ∼1 cm −2 . It is well‐established that the BP1T needles are grown in the vapor‐phase growth method . Yet, in the present work we have found out for the first time that the well‐defined microings are formed on the KCl surfaces.…”

Section: Resultssupporting

confidence: 59%

“…These PL spectra show many sharp peaks ranging from 1.8 to 2.9 eV superposed on a continuous PL band. PL spectra that include such sharp peak series have been observed even for the BP1T needles . The needles act as FP cavities because of their well‐defined end facets, and the peak series have been attributed to the FP modes.…”

Section: Resultsmentioning

confidence: 99%

“…For the BP1T needle crystals, the FP mode spacings monotonously decrease with increasing energy because of their group refractive index . A similar energy dependence of the mode spacings is observed even for the microrings.…”

Section: Resultsmentioning

confidence: 99%

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Self‐Assembled Organic Crystalline Microring Cavities with High Q‐Factors

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Organic crystalline microstructures are recently a target of intense research from the point of view of photonic devices such as microcavities and optical waveguides. A bottom‐up method based upon self‐assembly produces organic microstructures including oriented needles. A top‐down approach, in turn, enabled the fabrication of microstructures of different morphologies and configurations such as microrings and microdisks. In the present study, by using a bottom‐up technique we have developed organic microrings of high crystallinity with minimized crystal imperfections. We have found out that the said microrings function as resonators with high quality (Q) factors. We observe a series of sharply resolved peaks in their photoluminescence spectra and assign those peaks to whispering gallery modes formed in the microrings. Their mode numbers are precisely determined from their mode spacings with the maximum of Q‐factor being ∼2000. The number is extremely high compared with those of other organic microrings of the same size.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

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Self‐Assembled Organic Crystalline Microring Cavities with High Q‐Factors

et al. 2018

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“…The patterning OSSC arrays in defined positions and orientations and the realization of large‐size OSSCs are important for advancing their applications in integrated circuits. An efficient strategy for achieving patterned OSSCs under PVT conditions involves the incorporation of appropriate substrates with prepatterned microstructures/rough surfaces or inorganic salts with periodic structures to provide the controllable nucleation of vapor‐grown crystals through adjustment of the surface energy and epitaxial growth. Figure a‐ shows an example of oriented BP1T single‐crystal microwires grown on a KCl substrate, which exhibits excellent waveguide properties .…”

Section: High‐performance Optoelectronic Materials For Osscsmentioning

confidence: 99%

“…An efficient strategy for achieving patterned OSSCs under PVT conditions involves the incorporation of appropriate substrates with prepatterned microstructures/rough surfaces or inorganic salts with periodic structures to provide the controllable nucleation of vapor‐grown crystals through adjustment of the surface energy and epitaxial growth. Figure a‐ shows an example of oriented BP1T single‐crystal microwires grown on a KCl substrate, which exhibits excellent waveguide properties . Although different OSSC patterns have been achieved via the modified PVT method, the alignment/positioning of OSSCs with a high degree of orientation over large areas through this strategy remains an open question.…”

Section: High‐performance Optoelectronic Materials For Osscsmentioning

confidence: 99%

Organic Semiconductor Single Crystals for Electronics and Photonics

2018

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Organic semiconducting single crystals (OSSCs) are ideal candidates for the construction of high-performance optoelectronic devices/circuits and a great platform for fundamental research due to their long-range order, absence of grain boundaries, and extremely low defect density. Impressive improvements have recently been made in organic optoelectronics: the charge-carrier mobility is now over 10 cm V s and the fluorescence efficiency reaches 90% for many OSSCs. Moreover, high mobility and strong emission can be integrated into a single OSSC, for example, showing a mobility of up to 34 cm V s and a photoluminescence yield of 41.2%. These achievements are attributed to the rational design and synthesis of organic semiconductors as well as improvements in preparation technology for crystals, which accelerate the application of OSSCs in devices and circuits, such as organic field-effect transistors, organic photodetectors, organic photovoltaics, organic light-emitting diodes, organic light-emitting transistors, and even electrically pumped organic lasers. In this context, an overview of these fantastic advancements in terms of the fundamental insights into developing high-performance organic semiconductors, efficient strategies for yielding desirable high-quality OSSCs, and their applications in optoelectronic devices and circuits is presented. Finally, an overview of the development of OSSCs along with current challenges and future research directions is provided.

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Tunable Near‐Infrared Organic Nanowire Nanolasers

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et al. 2017

Adv Funct Materials

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Organic semiconductor nanowires have inherent advantages, such as amenability to low-cost, low-temperature processing, and inherent four-level energy systems, which will significantly contribute to the organic solid-state lasers (OSSLs) and miniaturized laser devices. However, the realization of nearinfrared (NIR) organic nanowire lasers is always a big challenge due to the difficultly in fabrication of organic nanowires with diameters of ≈100 nm and material issues such as low photoluminescence quantum efficiency in the red-NIR region. What is more, the achievement of wavelength-tunable OSSLs has also encountered enormous challenge. This study first demonstrates the 720 nm NIR lasing with a low lasing threshold of ≈1.4 µJ cm −2 from the organic single-crystalline nanowires, which are self-assembled from small organic molecules of (E)-3-(4-(dimethylamino)-2-methoxyphenyl)-1-(1-hydroxynaphthalen-2-yl)prop-2-en-1-one through a facile solution-phase growth method. Notably, these individual nanowires' Fabry-Pérot cavity can alternatively provide the red-NIR lasing action at 660 or 720 nm from the 0-1 or 0-2 radiative transition channels, and the single (660 or 720 nm)/dual-wavelength (660 and 720 nm) laser action can be achieved by modulating the length of these organic nanowires due to the intrinsic self-absorption. These easilyfabricated organic nanowires are natural laser sources, which offer considerable promise for coherent light devices integrated on the optics microchip.

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Fabry–Pérot modes and optical waveguide effects in individual thiophene/phenylene co-oligomer nanoneedle crystals

Cited by 14 publications

References 25 publications

Self‐Assembled Organic Crystalline Microring Cavities with High Q‐Factors

Self‐Assembled Organic Crystalline Microring Cavities with High Q‐Factors

Organic Semiconductor Single Crystals for Electronics and Photonics

Tunable Near‐Infrared Organic Nanowire Nanolasers

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