Color-Changeable Optical Transport through Se-Doped CdS 1D Nanostructures

Pan, Anlian; Wang, Xiao; He, Peng-Bin; Zhang, Qinglin; Wan, Qiang; Zacharias, Margit; Zhu, Xing; Zou, B. S.

doi:10.1021/nl0710295

Cited by 67 publications

(75 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,16 Use of extrinsic optical feedback such as photonic crystals to achieve better mode selectivity is another approach. However, the high-cost and complicated fabrication required, together with the weak coupling and the high optical losses between the two different cavities would offset any advantages.…”

Section: Abstract: Cadium Sulfide Nanowire Cavity Urbach Tail Wavementioning

confidence: 99%

See 1 more Smart Citation

Tailoring the Lasing Modes in Semiconductor Nanowire Cavities Using Intrinsic Self-Absorption

et al. 2013

View full text Add to dashboard Cite

Understanding the optical gain and mode-selection mechanisms in semiconductor nanowire (NW) laser is key to the development of high-performance nanoscale oscillators, amplified semiconductor/plasmon lasers and single photon emitters, etc. Modification of semiconductor band structure/bandgap through electric field modulation, elemental doping or alloying semiconductors has so far gained limited success in achieving output mode tunability of the NW laser. One stifling issue is the considerable optical losses induced in the NW cavities by these extrinsic methods that limit their applicability. Herein we demonstrate a new optical self-feedback mechanism based on the intrinsic self-absorption of the gain media to achieve lowloss, room-temperature NW lasing with a high degree of mode selectivity (over 30 nm). The cadmium sulfide (CdS) NW lasing wavelength is continously tunable from 489 nm to 520 nm as the length of the NWs increases from 4 to 25 m. Our straightforward approach is widely applicable in most semiconductor or semiconductor/plasmonic NW cavities. Single crystalline semiconductor Fabry-Pé rot or whispering gallery nanowire (NW) cavity possessing naturally formed flat facets for good optical feedback is an ideal gain media for light amplification. [1][2][3][4][5][6][7][8][9][10] They are considered as one of the most important and promising routes to realizing miniaturized nanolasers and amplifiers. [11][12][13] Recent groundbreaking work on utilizing semiconductor NW cavities to compensate the damping loss and amplify the collective electron oscillations in plasmon nanocavities has kindled even greater interests in this field. 2,13,14 For practical applications, the ability to tailor the NW cavity mode is essential for developing multi-color miniaturized lasers, and critical for optimizing the resonant energy transfer between the cavity and the coupled system. 15 For a II-VI or III-V NW Fabry-Pé rot cavity, it is generally accepted that the output laser wavelength is determined by the bandgap of semiconductor NW. 11 To date, there is only limited success in tuning the optical cavity modes through (a) electric field modulation; and (b) elemental doping of the semiconductors. 6,9,16 In the former approach where the bandgap is modulated via the Franz-Keldysh or Stark effects, the NW cavities are highly susceptible to damage and only narrow tunability around 10 nm is demonstrated; 17 while in the later approach, the NW cavities are prone to structural defects induced by the dopants, thereby restricting the cavity gain. Keywords: Cadium sulfide, nanowire cavity, Urbach tail, Waveguide, lasingThough broadband tunable lasing wavelengths spanning 100 nm or more have been demonstrated in ternary semicondutor NW cavities, 18 cavity gain is however limited by the structural defects formed during the growth phase. 7,16 Use of extrinsic optical feedback such as photonic crystals to achieve better mode selectivity is another approach. However, the high-cost and complicated fabrication required, together with th...

show abstract

Section: Abstract: Cadium Sulfide Nanowire Cavity Urbach Tail Wavementioning

confidence: 99%

“…Theoretically, the absorption coefficient (E) of a semiconductor, with contributions from the Urbach rule 16,25,39 can be described by the following expressions:…”

mentioning

confidence: 99%

Tailoring the Lasing Modes in Semiconductor Nanowire Cavities Using Intrinsic Self-Absorption

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Only a strong absorption edge is observed at about 250 nm. The absorption coefficient a of can be defined by the following equation (Pan et al 2007):…”

Section: Resultsmentioning

confidence: 99%

Two-step excitation structure changes of luminescence centers and strong tunable blue emission on surface of silica nanospheres

et al. 2015

Self Cite

View full text Add to dashboard Cite

We report a scheme for investigating twostep stimulated structure change of luminescence centers. Amorphous silica nanospheres with uniform diameter of 9-15 nm have been synthesized by Stöber method. Strong hydroxyl-related infrared-absorption band is observed in infrared spectrum. The surface hydroxyl groups exert great influence on the luminescent behavior of silica. They provide stable and intermediate energy states to accommodate excitation electrons. The existence of these surface states reduces the energy barrier of photochemical reactions, creating conditions for two-step excitation process. By carefully examining excitation and emission process, the nearest excitation band is absent in both optical absorption spectrum and excitation spectrum. This later generated state confirms the generation of new luminescence centers as well as the existence of photochemical reactions. Stimulated by different energies, two-step excitation process impels different photochemical reactions, prompting generation of different lattice defects on surface area of silica.Thereby, tunable luminescence is achieved. After thermal treatment, strong gap excitation band appears with the disappearance of strong surface excitation band. Strong blue luminescence also disappears. The research is significance to precise introducing structural defects and controlling position of luminescence peaks.

show abstract

“…6 Due to the strong optical confinement in the lateral directions, semiconductor nanostripes are found to have promising optical transport properties. 7 It is due to the high refractive index for a SPP wave on a metal-dielectric interface compared to a metal-air interface, giving rise to SPP modes bound by the dielectric stripe similar to the guided modes in conventional optical fibers. Low edge-scattering losses in dielectric-loaded SPP ͑DLSPP͒ waveguides can be achieved in comparison to the bare metallic stripe waveguides of the same width.…”

Section: Excitation Of Dielectric-loaded Surface Plasmon Polariton Obmentioning

confidence: 99%

Excitation of dielectric-loaded surface plasmon polariton observed by using near-field optical microscopy

Zhang

Liú

Zhu

2008

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

The excitation of dielectric-loaded surface plasmon polariton (DLSPP) by a CdS nanostripe placed on a Ag layer is observed by using a scanning near-field optical microscopy (SNOM). The spectroscopic redshift of 30 meV of photoluminescence is observed at different positions of the stripe by SNOM and can be explained as the result of Franz–Keldysh effect. Finite difference time domain calculations confirm the observations of the near-field optical images and spectroscopic data. This DLSPP excitation structure is important in the implementation of photonic integrated circuits as well as the optical guiding modes in plasmonic devices.

show abstract

Color-Changeable Optical Transport through Se-Doped CdS 1D Nanostructures

Cited by 67 publications

References 23 publications

Tailoring the Lasing Modes in Semiconductor Nanowire Cavities Using Intrinsic Self-Absorption

Tailoring the Lasing Modes in Semiconductor Nanowire Cavities Using Intrinsic Self-Absorption

Two-step excitation structure changes of luminescence centers and strong tunable blue emission on surface of silica nanospheres

Excitation of dielectric-loaded surface plasmon polariton observed by using near-field optical microscopy

Contact Info

Product

Resources

About