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Shape-engineering of self-assembled organic single microcrystal as optical microresonator for laser applications.

Wang X, Liao Q, Lu X, Li H, Xu Z, Fu H - Sci Rep (2014)

Bottom Line: Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator.More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature.These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

View Article: PubMed Central - PubMed

Affiliation: 1] Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China [2] Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

ABSTRACT
Single micro/nanocrystals based on π-conjugated organic molecules have caused tremendous interests in the optoelectronic applications in laser, optical waveguide, nonlinear optics, and field effect transistors. However, the controlled synthesis of these organic micro/nanocrystals with regular shapes is very difficult to achieve, because the weak interaction (van der Waals' force, ca. 5 kJ/mol) between organic molecules could not dominate the kinetic process of crystal growth. Herein, we develop an elaborate strategy, selective adhesion to organic crystal plane by the hydrogen-bonding interaction (ca. 40 kJ/mol), for modulating the kinetic process of the formation of microcrystal, which leads to the self-assembly of one organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-on (HDMAC) into one-dimensional (1D) microwires and 2D microdisks respectively. Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator. More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature. These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

No MeSH data available.


Related in: MedlinePlus

Selective adhesion to the (002) HDMAC crystal plane via hydrogen-bonding interaction.(a) The TEM image of one typical microwire. Inset: the SAED pattern of this selected microwire. (b) The TEM image of one typical microdisk. Inset: the SAED pattern of this corresponding microdisk. (c) The HDMAC molecular packing mode in microcrystal and schematic depiction for the mechanism of crystal growth.
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f2: Selective adhesion to the (002) HDMAC crystal plane via hydrogen-bonding interaction.(a) The TEM image of one typical microwire. Inset: the SAED pattern of this selected microwire. (b) The TEM image of one typical microdisk. Inset: the SAED pattern of this corresponding microdisk. (c) The HDMAC molecular packing mode in microcrystal and schematic depiction for the mechanism of crystal growth.

Mentions: To investigate the molecular packing mode of HDMAC molecules within 1D-MWs and 2D-MDs, selected area electron diffraction (SAED) and X-ray diffraction (XRD) measurements were carried out. The transmission electron microscopy (TEM) images of individual 1D-MW and 2D-MD are respectively shown in Fig. 2a and 2b. And the insets of Fig. 2a and 2b depict the selected area electron diffraction (SAED) pattern, recorded by directing the electron beam perpendicular to the corresponding individual lying microwire and microdisk, respectively. On the basis of the monoclinic single-crystal data of HDMAC, both 1D-MWs and 2D-MDs belong to the cell parameters of a = 12.1194(14) Å, b = 10.2869(8) Å, c = 12.5048(16) Å, α = γ = 90°, β = 115.864(8)°41. Further analysis of SAED pattern in the inset of Fig. 2a, the circled SAED spot corresponds to (010) crystal plane with a d-spacing value of 10.3 Å. It indicates that 1D-MWs preferentially grow along the crystal [010] direction. In contrast to the 1D-MW, the 2D-MD shows 2D-growth direction. In the inset of Fig. 2b, the triangled sets of SAED spots are ascribed to reflections from (002) crystal planes with a d-spacing value of 6.3 Å, while the circled set of SAED spots is due to (010) crystal planes with a d-spacing value of 10.2 Å. Additional X-ray diffraction pattern (supplementary Fig. S2) has validated the formation of single-crystalline 1D wires and 2D disks with only a sequence of peaks corresponding to the (100) crystal planes, while other peaks observable in the powder pattern (black curve) are not detected. This indicates the relative abundance of (100) facets on the surfaces of 1D-MWs and 2D-MDs facets. We can conclude that single crystalline 1D-MWs preferentially grow along the [010] direction while single crystalline 2D-MDs grow along the two directions: [010] and [002] crystal directions.


Shape-engineering of self-assembled organic single microcrystal as optical microresonator for laser applications.

Wang X, Liao Q, Lu X, Li H, Xu Z, Fu H - Sci Rep (2014)

Selective adhesion to the (002) HDMAC crystal plane via hydrogen-bonding interaction.(a) The TEM image of one typical microwire. Inset: the SAED pattern of this selected microwire. (b) The TEM image of one typical microdisk. Inset: the SAED pattern of this corresponding microdisk. (c) The HDMAC molecular packing mode in microcrystal and schematic depiction for the mechanism of crystal growth.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4228325&req=5

f2: Selective adhesion to the (002) HDMAC crystal plane via hydrogen-bonding interaction.(a) The TEM image of one typical microwire. Inset: the SAED pattern of this selected microwire. (b) The TEM image of one typical microdisk. Inset: the SAED pattern of this corresponding microdisk. (c) The HDMAC molecular packing mode in microcrystal and schematic depiction for the mechanism of crystal growth.
Mentions: To investigate the molecular packing mode of HDMAC molecules within 1D-MWs and 2D-MDs, selected area electron diffraction (SAED) and X-ray diffraction (XRD) measurements were carried out. The transmission electron microscopy (TEM) images of individual 1D-MW and 2D-MD are respectively shown in Fig. 2a and 2b. And the insets of Fig. 2a and 2b depict the selected area electron diffraction (SAED) pattern, recorded by directing the electron beam perpendicular to the corresponding individual lying microwire and microdisk, respectively. On the basis of the monoclinic single-crystal data of HDMAC, both 1D-MWs and 2D-MDs belong to the cell parameters of a = 12.1194(14) Å, b = 10.2869(8) Å, c = 12.5048(16) Å, α = γ = 90°, β = 115.864(8)°41. Further analysis of SAED pattern in the inset of Fig. 2a, the circled SAED spot corresponds to (010) crystal plane with a d-spacing value of 10.3 Å. It indicates that 1D-MWs preferentially grow along the crystal [010] direction. In contrast to the 1D-MW, the 2D-MD shows 2D-growth direction. In the inset of Fig. 2b, the triangled sets of SAED spots are ascribed to reflections from (002) crystal planes with a d-spacing value of 6.3 Å, while the circled set of SAED spots is due to (010) crystal planes with a d-spacing value of 10.2 Å. Additional X-ray diffraction pattern (supplementary Fig. S2) has validated the formation of single-crystalline 1D wires and 2D disks with only a sequence of peaks corresponding to the (100) crystal planes, while other peaks observable in the powder pattern (black curve) are not detected. This indicates the relative abundance of (100) facets on the surfaces of 1D-MWs and 2D-MDs facets. We can conclude that single crystalline 1D-MWs preferentially grow along the [010] direction while single crystalline 2D-MDs grow along the two directions: [010] and [002] crystal directions.

Bottom Line: Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator.More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature.These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

View Article: PubMed Central - PubMed

Affiliation: 1] Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China [2] Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

ABSTRACT
Single micro/nanocrystals based on π-conjugated organic molecules have caused tremendous interests in the optoelectronic applications in laser, optical waveguide, nonlinear optics, and field effect transistors. However, the controlled synthesis of these organic micro/nanocrystals with regular shapes is very difficult to achieve, because the weak interaction (van der Waals' force, ca. 5 kJ/mol) between organic molecules could not dominate the kinetic process of crystal growth. Herein, we develop an elaborate strategy, selective adhesion to organic crystal plane by the hydrogen-bonding interaction (ca. 40 kJ/mol), for modulating the kinetic process of the formation of microcrystal, which leads to the self-assembly of one organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-on (HDMAC) into one-dimensional (1D) microwires and 2D microdisks respectively. Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator. More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature. These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

No MeSH data available.


Related in: MedlinePlus