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Record W2483561474 · doi:10.1117/3.601520.ch8

Confronting the Diffraction Limit

2009· book-chapter· en· W2483561474 on OpenAlex

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueSPIE eBooks · 2009
Typebook-chapter
Languageen
FieldMaterials Science
TopicOptical Coatings and Gratings
Canadian institutionsAdvanced Micro Devices (Canada)
Fundersnot available
KeywordsOpticsDiffractionPhysicsBeam (structure)GratingWavelengthDiffraction gratingLight beam

Abstract

fetched live from OpenAlex

As k 1 factors [Eq. (2.8)] fall below 0.8, a number of effects become observable that are not seen when k 1 is larger. Processes with small values of k 1 began to appear in the mid-1990s, and are quite common today, as seen from Table 8.1. Some of the effects seen in patterns generated with low-k 1 processes are discussed in this chapter. Several techniques also described—such as off-axis illumination and phase-shifting masks—have been developed to address the shortcomings of optical imaging as feature sizes become smaller than the wavelength of light. Methods to improve image contrast that involve modification of the mask or illumination are referred to collectively as resolution enhancement techniques (RETs) and are discussed in this chapter. 8.1 Off-axis illumination As discussed earlier, light (coherent) that illuminates a grating is diffracted in very specific directions [Eq. (2.1)]. For normally incident light, sufficiently small dimensions result in situations where all beams except the zero-order are diffracted outside the entrance pupil of the imaging optics (Fig. 8.1). In this case, no pattern is formed, because a single beam is a plane wave, containing no spatial information, as explained in Chapter 2. For normally incident (“on-axis”) illumination, the grating is not imaged when the pitch is too small, because only a single beam, the zero-order beam, is transmitted through the lens. This illustrates the limitation to resolution imposed by diffraction.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesInsufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Not applicable · Consensus signal: none
GenreCandidate signal: Other · Consensus signal: Other
Teacher disagreement score0.914
Threshold uncertainty score1.000

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.001

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.022
GPT teacher head0.233
Teacher spread0.211 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it