### Top 10 Arxiv Papers Today in Optics

##### #1. Self-stabilizing laser sails based on optical metasurfaces
###### Joel Siegel, Anthony Wang, Sergey G. Menabde, Mikhail A. Kats, Min Seok Jang, Victor Watson Brar
This article investigates the stability of 'laser sail'-style spacecraft constructed from dielectric metasurfaces with areal densities $<$1g/m$^2$. We show that the microscopic optical forces exerted on a metasurface by a high power laser (100 GW) can be engineered to achieve passive self-stabilization, such that it is optically trapped inside the drive beam, and self-corrects against angular and lateral perturbations. The metasurfaces we study consist of a patchwork of beam-steering elements that reflect light at different angles and efficiencies. These properties are varied for each element across the area of the metasurface, and we use optical force modeling tools to explore the behavior of several metasurfaces with different scattering properties as they interact with beams that have different intensity profiles. Finally, we use full-wave numerical simulation tools to extract the actual optical forces that would be imparted on Si/SiO$_{2}$ metasurfaces consisting of more than 400 elements, and we compare those results to our...
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qraal: [1903.09077] Self-stabilizing laser sails based on optical metasurfaces https://t.co/8xKzsHL3TP
mickeykats: New preprint: "Self-stabilizing laser sails based on optical metasurfaces" https://t.co/uyZGTVjHeX This is a collaboration with + led by Victor Brar's group in the Physics Dept @UWMadison. On my group's side, funded by @AFOSR https://t.co/HF5bF0RLNt
CondensedPapers: Self-stabilizing laser sails based on optical metasurfaces. https://t.co/GeSWBPFU0v
StarshipBuilder: Self-stabilizing laser sails based on optical metasurfaces https://t.co/qS1DBmOWVB
AFOSR: RT @mickeykats: New preprint: "Self-stabilizing laser sails based on optical metasurfaces" https://t.co/uyZGTVjHeX This is a collaboration…
nyrath: RT @StarshipBuilder: Self-stabilizing laser sails based on optical metasurfaces https://t.co/qS1DBmOWVB
A_J_Higgins: RT @StarshipBuilder: Self-stabilizing laser sails based on optical metasurfaces https://t.co/qS1DBmOWVB
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Authors: 6
Total Words: 6775
Unqiue Words: 2022

##### #2. Cascaded Rotational Doppler Effect
###### Junhong Deng, King Fai Li, Wei Liu, Guixin Li
We propose and substantiate experimentally the cascaded rotational Doppler effect for interactions of spinning objects with light carrying angular momentum. Based on the law of parity conservation for electromagnetic interactions, we reveal that the frequency shift can be doubled through cascading two rotational Doppler processes which are mirror-imaged to each other. This effect is further experimentally verified with a rotating half-wave plate, and the mirror-imaging process is achieved by reflecting the frequency-shifted circularly polarized wave upon a mirror with a quarter-wave plate in front of it. The mirror symmetry and thus parity conservation guarantees that this doubled frequency shift can be further multiplied with more successive mirror-imaging conjugations, with photons carrying spin and/or orbital angular momentum, which could be widely applied for detection of rotating systems ranging from molecules to celestial bodies with high precision and sensitivity.
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PhysicsPaper: Cascaded Rotational Doppler Effect. https://t.co/obJUnaYEef
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Authors: 4
Total Words: 3252
Unqiue Words: 1163

##### #3. Proper scaling for triangular aperture in OAM measurement
###### Dina Grace C. Banguilan, Nathaniel Hermosa
A standard triangular aperture for measuring the orbital angular momentum (OAM) of light by diffraction usually has a fixed and limited radius R. This possesses a crucial issue since for an increasing topological charge m of an OAM beam, the radius r of the beam also increases. Here, we prove experimentally our supposition. We use a dynamic triangular aperture that can be programmed to have different characteristic R to diffract beams of various OAM values. By analysing the diffraction patterns with 2d-correlation, we find a minimum bound for R. For a constant initial waist $w$ in the spatial light modulator and a constant position z of the aperture system, we find that the radius of the aperture is unique for each m value. Interestingly, this R scales according to the literature-reported beam's rms radius. We also show that with larger aperture, a smearing effect can be seen in the diffraction patterns which becomes a setback on discerning fringes for the measurement of the topological charge value and thus of the OAM of light....
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PhysicsPaper: Proper scaling for triangular aperture in OAM measurement. https://t.co/x8Esm1cwtC
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Authors: 2
Total Words: 5030
Unqiue Words: 1716

##### #4. The first evidence of current-injection organic semiconductor laser with field-effect transistor
###### Thangavel Kanagasekaran, Hidekazu Shimotani, Keiichiro Kasai, Shun Onuki, Rahul D. Kavthe, Ryotaro Kumashiro, Nobuya Hiroshiba, Tienan Jin, Naoki Asao, Katsumi Tanigaki
Laser is one of the most important discoveries in the 20th century, and inorganic semiconductor lasers (ISCL) are most frequently used in many applications nowadays. Organic semiconductor lasers (OSCL) have many attractive features when they compared to ISCLs, such as flexibility, human friendliness, feasible and inexpensive production process, light weight, and multicolor emission. However, electrically driven OSCLs (el-OSCL) have not yet been realized, although they are possible in an optically driven mode. Here, we report that an el-OSCL can be realized in field-effect transistor (FET) structure. The FET el-OSCL with distributed feedback (DFB) construction is made using a BP3T single crystal as a lasing medium electrostatically laminated on a silicon substrate modified with periodically patterned poly-styrene by applying a hot embossing method. An emergent sharp-linewidth laser emission spectrum to the resolution limit of a detector and a non-linear increase in intensity above the threshold current density of ca.1 kA cm-2 is...
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PhysicsPaper: The first evidence of current-injection organic semiconductor laser with field-effect transistor. https://t.co/V02Yi9jrfM
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Authors: 10
Total Words: 4058
Unqiue Words: 1469

##### #5. Analytical vs. Numerical Langevin Description of Noise in Small Lasers
###### G. L. Lippi, J. Mørk, G. P. Puccioni
We compare the analytical and numerical predictions of noise in nano- and microcavity lasers obtained from a rate equation model with stochastic Langevin noise. Strong discrepancies are found between the two approaches and these are critically analyzed and explained on the basis of general considerations and through the comparison to the numerical predictions of a Stochastic Laser Simulator. While the analytical calculations give reliable redictions, the numerical results are entirely incorrect thus unsuitable for predicting the dynamics and statistical properties of small lasers.
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PhysicsPaper: Analytical vs. Numerical Langevin Description of Noise in Small Lasers. https://t.co/TUAm9MrP49
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Authors: 3
Total Words: 3442
Unqiue Words: 1418

##### #6. High optical magnetism of dodecahedral plasmonic meta-atoms
###### Véronique Many, Romain Dézert, Etienne Duguet, Alexandre Baron, Vikas Jangid, Virginie Ponsinet, Serge Ravaine, Philippe Richetti, Philippe Barois, Mona Tréguer-Delapierre
The generation in artificial composites of a magnetic response to light comparable in magnitude with the natural electric response, may offer an invaluable control parameter for a fine steering of light at the nanoscale. In many experimental realizations however, the magnetic response of artificial meta-atoms is too weak so that there is a need for new designs with increased magnetic polarizability. Numerical simulations show that geometrical plasmonic nanostructures based on the ideal model of Platonic solids are excellent candidates for the production of strong optical magnetism in visible light. Inspired by this model, we developed a bottom-up approach to synthesize plasmonic nano-clusters made of twelve gold patched located at the center of the faces of a dodecahedron. The scattering of the electric and magnetic dipole induced by light are measured across the whole visible range. The ratio of the magnetic to electric response at resonance is found three times higher than its counterpart measured on disordered plasmonic...
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PhysicsPaper: High optical magnetism of dodecahedral plasmonic meta-atoms. https://t.co/TKt16IGpDR
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Sample Sizes : [12, 46812]
Authors: 10
Total Words: 5732
Unqiue Words: 2050

##### #7. Self-assembled nanostructured metamaterials
###### Virginie Ponsinet, Alexandre Baron, Emilie Pouget, Yutaka Okazaki, Reiko Oda, Philippe Barois
The concept of metamaterials emerged in years 2000 with the achievement of artificial structures enabling non conventional propagation of electromagnetic waves, such as negative phase velocity of negative refraction. The electromagnetic response of metamaterials is generally based on the presence of optically-resonant elements (or meta-atoms) of sub-wavelength size and well designed morphology so as to provide the desired electric and magnetic optical properties. Top-down technologies based on lithography techniques have been intensively used to fabricate a variety of efficient electric and magnetic resonators operating from microwave to visible light frequencies. However, the technological limits of the top-down approach are reached in visible light where a huge number of nanometre sized elements is required. We show here that the bottom-up fabrication route based on the combination of nanochemistry and of the self-assembly methods of colloidal physics provide an excellent alternative for the large scale synthesis of complex...
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PhysicsPaper: Self-assembled nanostructured metamaterials. https://t.co/yJZkwgs7EF
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Authors: 6
Total Words: 4920
Unqiue Words: 2010

##### #8. Spectral singularities of a potential created by two coupled microring resonators
###### Vladimir V. Konotop, Barry C. Sanders, Dmitry A. Zezyulin
Two microring resonators, one with gain and one with loss, coupled to each other and to a bus waveguide, create an effective non-Hermitian potential for light propagating in the waveguide. Due to geometry, coupling for each microring resonator yields two counter-propagating modes with equal frequencies. We show that such a system enables implementation of many types of scattering peculiarities, which are either the second or fourth order. The spectral singularities separate parameter regions where the spectrum is either pure real or else comprises complex eigenvalues; hence, they represent the points of the phase transition. By modifying the gain-loss relation for the resonators such an optical scatterer can act as a laser, as a coherent perfect absorber, be unidirectionally reflectionless or transparent, and support bound states either growing or decaying in time. These characteristics are observed for a discrete series of the incident-radiation wavelengths.
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PhysicsPaper: Spectral singularities of a potential created by two coupled microring resonators. https://t.co/CoB58Jm7f8
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Authors: 3
Total Words: 4699
Unqiue Words: 1451

##### #9. Tunable MEMS VCSEL on Silicon substrate
###### Hitesh Kumar Sahoo, Thor Ansbæk, Luisa Ottaviano, Elizaveta Semenova, Fyodor Zubov, Ole Hansen, Kresten Yvind
We present design, fabrication and characterization of a MEMS VCSEL which utilizes a silicon-on-insulator wafer for the microelectromechanical system and encapsulates the MEMS by direct InP wafer bonding, which improves the protection and control of the tuning element. This procedure enables a more robust fabrication, a larger free spectral range and facilitates bidirectional tuning of the MEMS element. The MEMS VCSEL device uses a high contrast grating mirror on a MEMS stage as the bottom mirror, a wafer bonded InP with quantum wells for amplification and a deposited dielectric DBR as the top mirror. A 40 nm tuning range and a mechanical resonance frequency in excess of 2 MHz are demonstrated.
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PhysicsPaper: Tunable MEMS VCSEL on Silicon substrate. https://t.co/ixE8KBVsYu
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Authors: 7
Total Words: 6074
Unqiue Words: 1875

##### #10. Plane-wave scattering by an ellipsoid composed of an orthorhombic dielectric-magnetic material with arbitrarily oriented constitutive principal axes
###### H. M. Alkhoori, A. Lakhtakia, J. K. Breakall, C. F. Bohren
The extended boundary condition method can be formulated to study plane-wave scattering by an ellipsoid composed of an orthorhombic dielectric-magnetic material whose relative permittivity dyadic is a scalar multiple of its relative permeability dyadic, when the constitutive principal axes are arbitrarily oriented with respect to the shape principal axes. Known vector spherical wavefunctions are used to represent the fields in the surrounding matter-free space. After deriving closed-form expressions for the vector spherical wavefunctions for the scattering material, the internal fields are represented as superpositions of those vector spherical wavefunctions. The unknown scattered-field coefficients are related to the known incident-field coefficients by a transition matrix. The total scattering and absorption efficiencies are highly affected by the orientation of the constitutive principal axes relative to the shape principal axes, and the effect of the orientational mismatch between the two sets of principal axes is...
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PhysicsPaper: Plane-wave scattering by an ellipsoid composed of an orthorhombic dielectric-magnetic material with arbitrarily oriented constitutive principal axes. https://t.co/etQUuzJzIk
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Authors: 4
Total Words: 8359
Unqiue Words: 1835

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