An elastomeric grating coupler

We report on a novel nondestructive and reversible method for coupling free space light to planar optical waveguides. In this method, an elastomeric grating is used to produce an effective refractive index modulation on the surface of the optical waveguide. The external elastomeric grating binds to the surface of the waveguide with van der Waals forces and makes conformal contact without any applied pressure. As a demonstration of the feasibility of the approach, we use it to measure the refractive index of a silicon oxynitride film. This technique is nondestructive, reversible, low cost and can easily be applied to the characterization of optical materials for integrated optics

Money for Something: Music Licensing in the 21st Century

[Excerpt] The laws that determine who pays whom in the digital world were written, by and large, at a time when music was primarily performed via radio broadcasts or distributed through physical media (such as sheet music and phonograph records), and when each of these forms of music delivery represented a distinct channel with unique characteristics. With the emergence of the Internet, Congress updated some copyright laws in the 1990s. It applied one set of legal provisions to digital services it viewed as akin to radio broadcasts and another set to digital services it viewed as akin to physical media. Since that time consumers have increasingly been consuming music via digital services that incorporate attributes of both radio and physical media. However, companies that compete in enabling consumers to access music may face very different costs to license music, depending on the technology they use and the features they offer. These differences in technology and features also affect the amount of money received by songwriters, performers, music publishers, and record companies. U.S. copyright law allows performers and record labels to collectively designate an agent to receive payments and to negotiate the licensing fees that certain types of digital music services must pay to stream music to their customers. Groups representing public radio and educational stations reached voluntary agreements with the agent, SoundExchange, in 2015. Rates paid by parties that do not reach voluntary agreements with SoundExchange during a limited negotiation period are instead set by the Copyright Royalty Board (CRB), a panel of three judges appointed by the Librarian of Congress. On December 16, 2015, the CRB set rates for online music streaming services for the period 2016 through 2020. For nonsubscription services, the CRB reduced the per-stream rate it had set in the previous rate proceeding, but the costs paid by several “small” music streaming services are likely to increase. Advocates of the small streaming services have launched a petition asking Congress to either allow their previous agreements to continue indefinitely or discontinue the requirement that small streaming services pay royalties to performers and record labels. SoundExchange has objected that the rates set by the CRB do not provide adequate compensation to performers and record labels. Members have introduced several bills in the 114th Congress that would change the amounts various participants in the music industry pay or receive in royalties. These bills are controversial, as they could alter the cost structures and revenues of broadcast radio stations, songwriters, performers, and others at a time when the music industry’s overall revenues are not growing. At the same time, the U.S. Department of Justice (DOJ) is continuing a review of consent decrees it entered into with music publishers in the 1940s. The outcome could affect the extent to which songwriters can control the use of their works

Relating magnetic reconnection to coronal heating

It is clear that the solar corona is being heated and that coronal magnetic fields undergo reconnection all the time. Here we attempt to show that these two facts are in fact related - i.e. coronal reconnection generates heat. This attempt must address the fact that topological change of field lines does not automatically generate heat. We present one case of flux emergence where we have measured the rate of coronal magnetic reconnection and the rate of energy dissipation in the corona. The ratio of these two, $P/\dot{\Phi}$, is a current comparable to the amount of current expected to flow along the boundary separating the emerged flux from the pre-existing flux overlying it. We can generalize this relation to the overall corona in quiet Sun or in active regions. Doing so yields estimates for the contribution to corona heating from magnetic reconnection. These estimated rates are comparable to the amount required to maintain the corona at its observed temperature.Comment: To appear in Phil. Trans. Royal Soc.

Out of Practice: The Twenty-First-Century Legal Profession

Lawyering has changed dramatically in the past century, but scholarly and regulatory models have failed to keep pace. Because these models focus exclusively on the practice of law as defined by the profession, they ignore many types of work that today\u27s lawyers perform and many sources of ethical tension they encounter. To address these shortcomings, I examine significant twentieth- and twenty-first-century social dynamics that are fundamentally altering contemporary lawyers\u27 work by broadening and blurring the boundary between law and business. Within the resulting boundary zone, a growing number of lawyers occupy roles for which legal training is valuable but licensure is not required. I argue that the ambiguity surrounding these roles—regarding what constitutes legal practice, what roles lawyers play, and what professional obligations attach—creates opportunities for abuse by individual lawyers and for ethical arbitrage by sophisticated corporate clients. The proliferation of these roles gives rise to key ethical tensions, ignored by existing models of the profession, that threaten to extinguish the profession\u27s public-facing orientation in favor of its private interests. I conclude that we cannot effectively understand and regulate the twenty-firstcentury legal profession until we move beyond the rigid constraints of existing models and begin to study the full range of roles and work settings—both in and out of practice—that today\u27s lawyers occupy

A Simple Approach to Preventing the Next Housing Crisis-Why We Need ONe, What One Would Look Like, and Why Dodd-Frank Isn\u27t It

This article considers the adequacy of The Dodd-Frank Act in terms of its potential ability to prevent another crisis in the housing market. The author argues that Dodd-Frank, even if implemented broadly, will not address the key problem of excess complexity in the housing and financial markets. The author then suggests additional reform focusing on simplicity, exemplified by the existing regulatory framework in Denmark. Lastly, the author addresses the current political economy, which is blamed for making the passage of effective regulation too difficult